Lenovo ThinkCentre M75n User Manual

ThinkCentre M75n User Guide

Read this first

Before using this documentation and the product it supports, ensure that you read and understand the following:

• Appendix A “Important safety information” on page 77

• Safety and Warranty Guide

• Setup Guide

First Edition (April 2020)

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS35F-05925.

Contents

About this documentation . . . . . . . . iii

Chapter 1. Meet your computer. . . . . 1

Top . . . . . . . . . . . . . . . . . . . . 1

Front . . . . . . . . . . . . . . . . . . . . 2

Rear . . . . . . . . . . . . . . . . . . . . 3

Bottom . . . . . . . . . . . . . . . . . . . 4

System board . . . . . . . . . . . . . . . . 5

Features and specifications . . . . . . . . . . . 7

Statement on USB transfer rate . . . . . . . . 8

Chapter 2. Get started with your

computer . . . . . . . . . . . . . . . . . 9

Get started with Windows 10 . . . . . . . . . . 9

Windows account . . . . . . . . . . . . . 9

Windows user interface . . . . . . . . . . 10

Connect to networks. . . . . . . . . . . . . 11

Connect to the wired Ethernet . . . . . . . 11

Connect to Wi-Fi networks (for selected

models) . . . . . . . . . . . . . . . . 11

Use Lenovo Vantage . . . . . . . . . . . . . 11

Use multimedia . . . . . . . . . . . . . . . 12

Use audio . . . . . . . . . . . . . . . 12

Connect to an external display . . . . . . . 12

Use the I/O box (for selected fanless models) . . . 13

Chapter 3. Explore your computer . . 17

Manage power . . . . . . . . . . . . . . . 17

Set power button behaviors . . . . . . . . 17

Set the power plan . . . . . . . . . . . . 17

Transfer data . . . . . . . . . . . . . . . . 17

Connect to a Bluetooth-enabled device (for

selected models) . . . . . . . . . . . . 17

Purchase accessories . . . . . . . . . . . . 18

Chapter 4. Secure your computer

and information . . . . . . . . . . . . 19

Lock the computer . . . . . . . . . . . . . 19

Use passwords . . . . . . . . . . . . . 20

Use software security solutions. . . . . . . . . 21

Use firewalls . . . . . . . . . . . . . . 21

Use antivirus programs . . . . . . . . . . 22

Use computrace Agent software embedded in

firmware (for selected models) . . . . . . . 22

Use BIOS security solutions . . . . . . . . . . 22

Erase all storage drive data . . . . . . . . 22

Use the cover presence switch . . . . . . . 22

Use Smart USB Protection. . . . . . . . . 23

Chapter 5. UEFI BIOS . . . . . . . . . 25

What is UEFI BIOS. . . . . . . . . . . . . . 25

Enter the BIOS menu. . . . . . . . . . . . . 25

Navigate in the BIOS interface . . . . . . . . . 25

Change the display language of UEFI BIOS . . . . 25

Change the display mode of UEFI BIOS . . . . . 26

Set the system date and time . . . . . . . . . 26

Change the startup sequence . . . . . . . . . 26

Enable or disable the configuration change

detection feature . . . . . . . . . . . . . . 27

Enable or disable the automatic power-on

feature . . . . . . . . . . . . . . . . . . 27

Enable or disable the smart power-on feature (for

selected models) . . . . . . . . . . . . . . 27

Enable or disable the ErP LPS compliance mode

(for selected models). . . . . . . . . . . . . 27

Change the ITS performance mode (for selected

models) . . . . . . . . . . . . . . . . . . 28

Change BIOS settings before installing a new

operating system . . . . . . . . . . . . . . 28

Update UEFI BIOS. . . . . . . . . . . . . . 29

Recover from a BIOS update failure . . . . . . . 29

Clear CMOS . . . . . . . . . . . . . . . . 30

Chapter 6. Troubleshooting,

diagnostics, and recovery . . . . . . . 31

Basic procedure for resolving computer

problems . . . . . . . . . . . . . . . . . 31

Troubleshooting . . . . . . . . . . . . . . 31

Startup problems . . . . . . . . . . . . 32

Audio problems . . . . . . . . . . . . . 33

Network problems . . . . . . . . . . . . 33

Performance problems . . . . . . . . . . 36

Storage drive problems . . . . . . . . . . 37

Serial connector problems. . . . . . . . . 37

USB device problems . . . . . . . . . . 37

Software problems. . . . . . . . . . . . 38

Lenovo diagnostic tools . . . . . . . . . . . 38

Recovery . . . . . . . . . . . . . . . . . 38

Restore system files and settings to an earlier

point . . . . . . . . . . . . . . . . . 38

Restore your files from a backup . . . . . . 38

Reset your computer . . . . . . . . . . . 38

Use advanced options . . . . . . . . . . 39

Windows automatic recovery. . . . . . . . 39

Create and use a recovery USB device . . . . 39

Update the device driver . . . . . . . . . 40

M.2 solid-state drives. . . . . . . . . . . 71

Chapter 7. CRU replacement . . . . . 41

What are CRUs . . . . . . . . . . . . . . . 41

Replace a CRU (for fan models) . . . . . . . . 41

Power adapter and power cord . . . . . . . 42

DIN rail bracket kit . . . . . . . . . . . . 43

Power adapter bracket kit . . . . . . . . . 45

VESA mount bracket kit . . . . . . . . . . 49

Rear Wi-Fi antenna. . . . . . . . . . . . 50

Bottom cover . . . . . . . . . . . . . . 51

Wi-Fi card . . . . . . . . . . . . . . . 53

M.2 solid-state drive . . . . . . . . . . . 54

Replace a CRU (for fanless models) . . . . . . . 55

Power adapter and power cord . . . . . . . 55

Heat sink cover . . . . . . . . . . . . . 57

DIN rail bracket kit . . . . . . . . . . . . 58

Power adapter bracket kit . . . . . . . . . 60

VESA mount bracket kit . . . . . . . . . . 63

I/O box . . . . . . . . . . . . . . . . 65

Rear Wi-Fi antenna. . . . . . . . . . . . 67

Bottom cover . . . . . . . . . . . . . . 68

Wi-Fi card . . . . . . . . . . . . . . . 69

Chapter 8. Help and support . . . . . 73

Self-help resources . . . . . . . . . . . . . 73

Call Lenovo . . . . . . . . . . . . . . . . 74

Before you contact Lenovo . . . . . . . . 74

Lenovo Customer Support Center . . . . . . 74

Purchase additional services. . . . . . . . . . 75

Appendix A. Important safety

information . . . . . . . . . . . . . . . 77

Appendix B. Accessibility and

ergonomic information . . . . . . . . 91

Appendix C. Supplemental information about the Ubuntu operating

system . . . . . . . . . . . . . . . . . 95

Appendix D. Compliance and TCO

Certified information. . . . . . . . . . 97

Appendix E. Notices and

trademarks . . . . . . . . . . . . . . . 109

ii ThinkCentre M75n User Guide

About this documentation

• Illustrations in this documentation might look different from your product.

• Depending on the model, some optional accessories, features, and software programs might not be available on your computer.

• Depending on the version of operating systems and programs, some user interface instructions might not be applicable to your computer.

• Documentation content is subject to change without notice. Lenovo makes constant improvements on the documentation of your computer, including this User Guide. To get the latest documentation, go to:

https://pcsupport.lenovo.com

• Microsoft® makes periodic feature changes to the Windows® operating system through Windows Update. As a result, some information in this documentation might become outdated. Refer to Microsoft resources for the latest information.

iv ThinkCentre M75n User Guide

Chapter 1. Meet your computer

Top

Fan models

Fanless models

1. ThinkCentre® LED

This indicator is on when the computer is on.

Front

Fan models

Fanless models

Press to turn on the computer.

1. Power button

2. Serial connectors (2)

3. USB-C

4. USB 2.0 connector

5. USB 3.2 connector Gen 2

6. Headset connector

™

(3.2 Gen 2) connector

To turn off the computer, open the Start menu, click Shut down.

The indicator in the power button shows the system status of your computer.

• On: The computer is on.

• Off: The computer is off or in hibernation mode.

• Blinking: The computer is in sleep mode.

• Breathing: The computer is in modern standby mode.

Used to connect an external modem, a serial printer, or other devices that use a serial connector.

• The output voltage and current are 5 V and 0.9 A.

• Transfer data at USB 3.2 speed, up to 10 Gbps.

• Connect to USB-C accessories to help expand your computer functionality. To purchase USB-C accessories, go to

Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB storage device, or USB printer.

Connect a headset or headphones to your computer.

https://www.lenovo.com/accessories.

Power, and then select

2 ThinkCentre M75n User Guide

Rear

Fan models

Fanless models

1. Power adapter connector Connect the power adapter to your computer for power supply.

2. DisplayPort

out connector

3. USB 3.2 connector Gen 2

4. USB-C

™

(3.2 Gen 2) connector

5. USB 2.0 connector

6. Ethernet connector

7. Security-lock slot

8. Wi-Fi

antenna slot*

Send audio and video signals from the computer to another audio or video device, such as a high-performance monitor.

Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB storage device, or USB printer.

• The output voltage and current are 5 V and 0.9 A.

• Transfer data at USB 3.2 speed, up to 10 Gbps.

• Connect to an external display:

– USB-C to VGA: 1900 x 1200 pixels, 60 Hz – USB-C to DP: 3840 x 2160 pixels, 60 Hz

• Connect to USB-C accessories to help expand your computer functionality. To

purchase USB-C accessories, go to

https://www.lenovo.com/accessories.

Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB storage device, or USB printer. This connector supports the smart power-on feature. For more information, see “Enable or disable the smart power-on feature (for selected models)” on page 27.

Connect to a local area network (LAN). When the green indicator is on, the computer is connected to a LAN. When the yellow indicator blinks, data is being transmitted.

Lock your computer to a desk, table, or other fixtures through a Kensington-style cable lock.

Used to install the rear Wi-Fi antenna cable connector that is available only on some models. The rear Wi-Fi antenna is installed on the rear Wi-Fi antenna cable connector.

* for selected models

Chapter 1. Meet your computer 3

Bottom

Fan models

Fanless models

1. VESA® threaded holes

4 ThinkCentre M75n User Guide

Connect the matched DIN rail bracket, power adapter bracket, or VESA mount bracket with the matched screws (M3 x 4 mm x 3 pcs) when you install the computer on a wall.

System board

Fan models

1 Microprocessor fan connector

3 Clear CMOS (Complementary Metal Oxide

Semiconductor) / Recovery jumper

5 M.2 solid-state drive slot 1

7 Wi-Fi card slot

2 Coin-cell battery connector

4 Internal speaker connector

6 M.2 solid-state drive slot 2 (M.2 SATA solid-state drive

compatible)

8 Cover presence switch connector (intrusion switch

connector)

Chapter 1. Meet your computer 5

Fanless models

1 Coin-cell battery connector 2 Clear CMOS (Complementary Metal Oxide

Semiconductor) / Recovery jumper

3 4G/5G LTE slot

5 M.2 solid-state drive slot 2 (for M.2 SATA solid-state

4 M.2 solid-state drive slot 1

6 Internal speaker connector

drive only)

7 Wi-Fi card slot

8 Cover presence switch connector (intrusion switch

connector)

6 ThinkCentre M75n User Guide

Features and specifications

Fan models:

• Width: 179 mm (7.05 inches)

• Height: 22 mm (0.87 inches)

• Depth: 88 mm (3.46 inches)

Dimensions

Weight (without the package)

Hardware configuration

Fanless models:

• Width: 179 mm (7.05 inches)

• Height: 34.5 mm (1.36 inches)

• Depth: 88 mm (3.46 inches)

Maximum configuration as shipped:

• Fan models: 0.51 kg (1.11 lb)

• Fanless models: 0.72 kg (1.59 lb)

1. Right-click the Start button to open the Start context menu.

2. Click Device Manager. Type the administrator password or provide confirmation if prompted.

Electrical input

Power supply 65-watt automatic voltage-sensing power adapter

Microprocessor

Memory

Storage device

Video features

Audio features

Expansion

• Input voltage: From 100 V ac to 240 V ac

• Input frequency: 50/60 Hz

To view the microprocessor information of your computer, right-click the Start button and then click System.

Double data rate 4 (DDR4) synchronous dynamic random-access memory module (SDRAM), soldered on the system board

Your computer supports up to two M.2 solid-state drives.

To know the storage drive capacity:

1. Right-click the Start button to open the Start context menu.

2. Click Disk Management.

Note: The storage drive capacity indicated by the system is less than the nominal capacity.

DisplayPort out connector

The integrated audio card supports the following:

• Headset connector

• Internal speaker*

• I/O box*

• M.2 solid-state drive slots (2)

• M.2 Wi-Fi slot

Network features

• Bluetooth*

• Ethernet LAN

• Wireless LAN*

Chapter 1. Meet your computer 7

* for selected models

Statement on USB transfer rate

Depending on many factors such as the processing capability of the host and peripheral devices, file attributes, and other factors related to system configuration and operating environments, the actual transfer rate using the various USB connectors on this device will vary and will be slower than the data rate listed below for each corresponding device.

USB device Data rate (Gbit/s)

3.2 Gen 1 / 3.1 Gen 1

3.2 Gen 2 / 3.1 Gen 2

3.2 Gen 2 × 2

8 ThinkCentre M75n User Guide

Chapter 2. Get started with your computer

Get started with Windows 10

Learn the basics of Windows 10 and start working with it right away. For more information about Windows 10, see the Windows help information.

Windows account

A user account is required to use the Windows operating system. It can either be a Windows user account or a Microsoft account.

Windows user account

When you start Windows for the first time, you are prompted to create a Windows user account. This first account you created is of the “Administrator” type. With an Administrator account, you can create additional user accounts or change account types by doing the following:

1. Open the Start menu and select Settings ➙ Accounts ➙ Family & other users.

2. Follow the on-screen instructions.

Microsoft account

You can also log in to the Windows operating system with a Microsoft account.

To create a Microsoft account, go to the Microsoft sign-up page at screen instructions.

With a Microsoft account, you can:

• Enjoy one-time signing in if you are using other Microsoft services, such as OneDrive, Skype, and Outlook. com.

• Sync personalized settings across other Windows-based devices.

https://signup.live.com and follow the on-

Windows user interface

1. Account

2. Documents

3. Pictures

4. Settings

5. Power

6. Start button

7. Windows Search

8. Task View

9. Windows notification area

10. Battery status icon

11. Network icon

12. Action center

Change account settings, lock the computer, or sign out from the current account.

Open the Documents folder, a default folder to save your received files.

Open the Pictures folder, a default folder to save your received pictures.

Launch Settings.

Shut down, restart, or put the computer into sleep mode.

Open the Start menu.

Type what you are looking for in the search box and get search results from your computer and the Web.

Display all opened apps and switch among them.

Display notifications and status of some features.

Display power status and change battery or power settings. When your computer is not connected to ac power, the icon changes to

Connect to an available wireless network and display the network status. When connected to a wired network, the icon changes to

Display the latest notifications from apps and provide quick access to some features.

Open the Start menu

• Click the Start button.

• Press the Windows logo key on the keyboard.

Open the Start context menu Right-click the Start button.

ThinkCentre M75n User Guide

Access Control Panel

• Open the Start menu and click Windows System ➙ Control Panel.

• Use Windows Search.

Launch an app

• Open the Start menu and select the app you want to launch.

• Use Windows Search.

Connect to networks

Your computer helps you connect to the world through a wired or wireless network.

Connect to the wired Ethernet

Connect your computer to a local network through the Ethernet connector on your computer with an Ethernet cable.

Connect to Wi-Fi networks (for selected models)

If your computer includes a wireless LAN module, you can connect your computer to Wi-Fi® networks. The wireless LAN module on your computer may support different standards. For some countries or regions, use of 802.11ax may be disabled according to local regulations.

1. Click the network icon in the Windows notification area. A list of available wireless networks is displayed.

2. Select a network available for connection. Provide required information, if needed.

Use Lenovo Vantage

The preinstalled Lenovo Vantage is a customized one-stop solution to help you maintain your computer with automated updates and fixes, configure hardware settings, and get personalized support.

Access Lenovo Vantage

Open the Start menu and click Lenovo Vantage. You also can type Lenovo Vantage in the search box.

To download the latest version of Lenovo Vantage, go to Microsoft Store and search by the app name.

Key features

Lenovo Vantage enables you to:

• Know the device status easily and customize device settings.

• Download and install UEFI BIOS, firmware and driver updates to keep your computer up-to-date.

• Monitor your computer health, and secure your computer against outside threats.

• Look up warranty status (online).

• Access User Guide and helpful articles.

Notes:

Chapter 2. Get started with your computer 11

• The available features vary depending on the computer model.

• Lenovo Vantage makes periodic updates of the features to keep improving your experience with your computer. The description of features might be different from that on your actual user interface.

Use multimedia

Use your computer for business or entertainment with the devices (such as a camera, a monitor, or speakers).

Use audio

To enhance the audio experience, connect speakers, headphones, or a headset to the audio connector.

Adjust the volume

1. Click the volume icon in the Windows notification area on the taskbar.

2. Follow the on-screen instructions to adjust the volume. Click the speaker icon to mute the audio.

Change the sound settings

1. Go to Control Panel and view by category.

2. Click Hardware and Sound ➙ Sound.

3. Change the settings as you prefer.

Connect to an external display

Connect to a wired display

Connect your computer to a projector or a monitor through the video output connector on your computer to give presentations or expand your workspace.

If your computer cannot detect the external display, right-click an empty area of the desktop, and then click

Display settings ➙ Detect.

Connect to a wireless display

To use a wireless display, ensure that both your computer and the external display support the Miracast feature.

• Open the Start menu, and then click Settings ➙ Devices ➙ Bluetooth & other devices ➙ Add Bluetooth or other device. In the Add a device window, click Wireless display or dock. Then, follow the instructions on the screen.

• Click the action center icon display and follow the on-screen instructions.

Set the display mode

Right-click a blank area on the desktop and select Display settings. Then, select a display mode of your preference from the Multiple displays menu.

in the Windows notification area and click Connect. Select the wireless

• Duplicate these displays: Display the same video output on both your computer screen and an external display.

• Extend these displays: Extend the video output from your computer display to an external display. You can drag and move items between the two displays.

• Show only on 1: Display the video output only on your computer screen.

ThinkCentre M75n User Guide

• Show only on 2: Display the video output only on an external display.

If you show programs using DirectDraw or Direct3D

in full-screen mode, only the main display shows the

video output.

Change display settings

1. Right-click a blank area on the desktop and select Display settings.

2. Select the display that you want to configure.

3. Change display settings of your preference.

You can change the settings for both the computer display and the external display. For example, you can define which one is the main display and which one is the secondary display. You also can change the resolution and orientation.

Note: If you set a higher resolution for the computer display than the external display, only part of the screen can be displayed on the external display.

Use the I/O box (for selected fanless models)

If your computer has an I/O box, you can use it to supply power to your computer and expand your computer functionality.

https://support.lenovo.com/solutions/iobox

Front

1. Serial connectors (2)

2. Ethernet connectors (2) (PoE)

• Connect an external modem, a serial printer, or other devices that use a serial connector.

• Support RS-232, RS-422, and RS-485 standards. The default standard is RS-

232. You can configure the connectors with the IoT IOBOX DT1 IO CONTROLLER application.

• Connect to a local area network (LAN). When the green indicator is on, the computer is connected to a LAN. When the yellow indicator blinks, data is being transmitted.

• Support Power over Ethernet (PoE) technology. Supply power to external device connected to this connector over an Ethernet cable, such as a VoIP phone, an IP camera, or other devices that also support PoE technology.

Note: To use the PoE function, the dc power input needs to be higher than 135 W.

Rear

The items

a , b , c , d shown below come with the I/O box.

Chapter 2. Get started with your computer 13

Connect to dc power for power supply through the DC-in connector

b .

Note: You can use the DC-in cable

1. DC-in power connector

environment where no dc power is available. Connect one end of the DC-in cable

a to a 135W ac power adapter or greater. and connect the other end to the DC-in

power connector on the I/O box. You can purchase the ac power adapter separately from Lenovo.

• Connect to the computer through the USB-C adapter

• Transfer data at USB 3.1 speed, up to 5 Gbps.

2. USB-C connector (USB 3.1 Gen 1)

• Supply power to the computer.

Note: When the computer is not connected to ac power and the I/O box is connected to dc power, the I/O box supplies power to the computer through the USB-C connector. In this case, the output voltage and current are 20 V and 3 A.

3. Digital input and Digital output (DI/DO) connectors

Connect to proximity sensors or other devices that use DI/DO connectors through the DI/DO adapters

d .

Digital Input and Digital Output Pin definition mapping table

a when you are testing the I/O box in an

c .

D-OUT pin number D-OUT pin definition D-IN pin number D-IN pin definition

COM

GND

Digital Output-1

Digital Output-2

Digital Output-3

Digital Output-4

COM

GND

3 Digital Input-1

4 Digital Input-2

Digital Input-3

6 Digital Input-4

14 ThinkCentre M75n User Guide

Digital Input and Digital Output

Digital Input

Digital Output

• Channels: 4

• Input type: NPN, PNP

• Dry contact:

– Logic 0: Open – Logic 1: Close to GND

• Wet contact:

– Logic 0: 0 V to 0.8 V – Logic 1: 5 V to 30 V

• Input resistance: 9.8 kΩ

• Isolation voltage: 1.5 kV (DC)

• Overvoltage protection: 70 V (DC)

• Channels: 4

• Output type: NPN

• Output voltage range: 5 V to 30 V

• Normal output current: 200 mA

• Isolation voltage: 1.5 kV (DC)

Chapter 2. Get started with your computer 15

16 ThinkCentre M75n User Guide

Chapter 3. Explore your computer

Manage power

Use the information in this section to achieve the best balance between performance and power efficiency.

Set power button behaviors

You can define what the power button does according to your preference. For example, by pressing the power button, you can turn off the computer or put the computer to sleep or hibernation mode.

To change what the power button does:

1. Go to Control Panel and view by large icons or small icons.

2. Click Power Options ➙ Choose what the power buttons do.

3. Change the settings as you prefer.

Set the power plan

For ENERGY STAR® compliant computers, the following power plan takes effect when your computers have been idle for a specified duration. The default power plan varies depending on your computer models. To know the machine type of your computer model, see “Before you contact Lenovo” on page 74.

Table 1. Default power plan when plugged into ac power (for machine types: 11BS, 11BT, 11BU, 11BV, 11GW, 11GX, 11GV, 11GY, 11C0, 11GB, 11HU, 11HV, 11HW, 11HX, 11HY, 11J0, 11J1, and 11J2)

• Turn off the display: After 10 minutes

• Put the computer to sleep: After 10 minutes

Table 2. Default power plan when plugged into ac power (for machine types: 11G4, 11G5, 11G6, 11G7, 11G8, 11G9, 11BW, and 11BX)

• Turn off the display: After 10 minutes

• Put the computer to sleep: After 25 minutes

To awaken the computer from Sleep mode, press any key on your keyboard.

To reset the power plan to achieve the best balance between performance and power saving:

1. Go to Control Panel and view by large icons or small icons.

2. Click Power Options, and then choose or customize a power plan of your preference.

Transfer data

Quickly share your files using the built-in Bluetooth technology among devices with the same features. You also can install a disc or media card to transfer data.

Connect to a Bluetooth-enabled device (for selected models)

You can connect all types of Bluetooth-enabled devices to your computer, such as a keyboard, a mouse, a smartphone, or speakers. To ensure that the connection is successful, place the devices 10 meters (33 feet), at most, from the computer.

1. Turn on Bluetooth on the computer. a. Open the Start menu, and then click Settings ➙ Devices ➙ Bluetooth & other devices. b. Turn on the Bluetooth switch.

2. Click Add Bluetooth or other device ➙ Bluetooth.

3. Select a Bluetooth device, and then follow the on-screen instructions.

Your Bluetooth device and computer will automatically connect the next time if the two devices are in range of each other with Bluetooth turned on. You can use Bluetooth for data transfer or remote control and communication.

Purchase accessories

Lenovo has a number of hardware accessories and upgrades to help expand the capabilities of your computer. Options include memory modules, storage devices, network cards, power adapters, keyboards, mice, and more.

To shop at Lenovo, go to

There are some tutorial videos that introduce how to use your computer with some accessories, such as ThinkCentre Nano TIO Cube, ThinkCentre Nano IoT IOBOX， and ThinkCentre Tiny/Nano Monitor Clamp II.

https://support.lenovo.com/solutions/nanofeaturevideo

https://www.lenovo.com/accessories.

18 ThinkCentre M75n User Guide

Chapter 4. Secure your computer and information

Lock the computer

Note: You are responsible for evaluating, selecting, and implementing the locking device and security

feature. Lenovo makes no comments, judgments, or warranties about the function, quality, or performance of the locking device and security feature. You can purchase computer locks from Lenovo.

Kensington-style cable lock (fan models)

Lock your computer to a desk, table, or other fixtures through a Kensington-style cable lock.

Kensington-style cable lock (fanless models)

Lock your computer to a desk, table, or other fixtures through a Kensington-style cable lock.

Log in to your computer securely

This section provides secure ways to log in to your computer with a password or your face.

Use passwords

Password types

You can set the following passwords in UEFI (Unified Extensible Firmware Interface) BIOS (Basic Input/ Output System) to prevent unauthorized access to your computer. However, you are not prompted to enter any UEFI BIOS password when your computer resumes from sleep mode.

• Power-on password When a power-on password is set, you are prompted to enter a valid password each time the computer is

turned on. The computer cannot be used until the valid password is entered.

• Supervisor password Setting a supervisor password deters unauthorized users from changing configuration settings. If you are

responsible for maintaining the configuration settings of several computers, you might want to set a supervisor password.

When a supervisor password is set, you are prompted to enter a valid password each time you try to enter the BIOS menu.

If both the power-on password and supervisor password are set, you can enter either password. However, you must use your supervisor password to change any configuration settings.

• Hard disk password Setting a hard disk password prevents unauthorized access to the data on the storage drive. When a hard

disk password is set, you are prompted to enter a valid password each time you try to access the storage drive.

ThinkCentre M75n User Guide

Note: After you set a hard disk password, your data on the storage drive is protected even if the storage drive is removed from one computer and installed in another.

• System management password (for selected models) You can enable the system management password to have the same authority as the supervisor

password to control security related features. To customize the authority of the system management password through the UEFI BIOS menu:

1. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1.

2. Select Security ➙ System Management Password Access Control.

3. Follow the on-screen instructions.

If you have set both the supervisor password and the system management password, the supervisor password overrides the system management password.

Set, change, and remove a password

Before you start, print these instructions.

1. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1.

2. Select Security.

3. Depending on the password type, select Set Supervisor Password, Set Power-On Password, Set System Management Password, or Hard Disk Password and press Enter.

4. Follow the on-screen instructions to set, change, or remove a password.

5. Press F10 or Fn+F10 to save the changes and exit.

You should record your passwords and store them in a safe place. If you forget the passwords, see “Clear CMOS” on page 30 to remove them by yourself. You can also contact a Lenovo-authorized service provider to have the passwords removed.

Notes:

• If the supervisor password is forgotten, it might not be removed by clearing CMOS depending on your BIOS settings.

• If the hard disk password is forgotten, Lenovo cannot remove the password or recover data from the storage drive.

Use software security solutions

This section provides software solutions to secure your computer and information.

Use firewalls

A firewall can be hardware, software, or a combination of both depending on the level of security required. Firewalls work on a set of rules to determine which inbound and outbound connections are authorized. If the computer is preinstalled with a firewall program, it helps protect against computer Internet security threats, unauthorized access, intrusions, and Internet attacks. It also protects your privacy. For more information about how to use the firewall program, refer to the help system of your firewall program.

To use firewalls:

1. Go to Control Panel and view by large icons or small icons.

2. Click Windows Defender Firewall, and then follow the on-screen instructions.

Chapter 4. Secure your computer and information 21

Use antivirus programs

The computer is preinstalled with an antivirus program to help you guard against, detect, and eliminate viruses.

Lenovo provides a full version of antivirus software on the computer with a free 30-day subscription. After 30 days, you must renew the license to continue receiving the antivirus software updates.

Note: Virus definition files must be kept up-to-date to guard against new viruses.

For more information about how to use your antivirus software, refer to the help system of your antivirus software.

Use computrace Agent software embedded in firmware (for selected models)

The Computrace Agent software is an IT asset management and computer theft recovery solution. The software detects if changes have been made on the computer, such as hardware, software, or the computer call-in location. You might have to purchase a subscription to activate the Computrace Agent software.

Use BIOS security solutions

This section provides BIOS solutions to secure your computer and information.

Erase all storage drive data

It is recommended that you erase all storage drive data before recycling a storage drive or the computer.

To erase all storage drive data:

1. Set a hard disk password for the storage drive you will recycle. See “Use passwords” on page 20.

2. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1.

3. Select Security ➙ Hard Disk Password ➙ Security Erase HDD Data and press Enter.

4. Select the storage drive you will recycle and press Enter.

5. A message is displayed, prompting you to confirm the operation. Select Yes and press Enter. The erasing process begins.

Note: During the erasing process, the power button and the keyboard are disabled.

6. After the erasing process is completed, a message is displayed, prompting you to reset the system. Select Continue.

Note: Depending on the storage drive capacity, the erasing process will take half an hour to three hours.

7. After the resetting process is completed, one of the following will happen:

• If the data on the system storage drive is erased, you will be prompted that no operating system is

available.

• If the data on the non-system storage drive is erased, the computer restarts automatically.

Use the cover presence switch

The cover presence switch prevents the computer from logging in to the operating system when the computer cover is not properly installed or closed.

To enable the cover presence switch connector on the system board:

1. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1.

ThinkCentre M75n User Guide

2. Select Security ➙ Cover Tamper Detected and press Enter.

3. Select Enabled and press Enter.

4. Press F10 or Fn+F10 to save the changes and exit.

When the cover presence switch connector on the system board is enabled, if the cover presence switch detects that the computer cover is not correctly installed or closed, an error message will be displayed when you turn on the computer. To bypass the error message and log in to the operating system:

1. Properly install or close the computer cover.

2. Enter the BIOS menu, save and then exit.

Use Smart USB Protection

The Smart USB Protection function is a security function that helps prevent data from being copied from the computer to USB storage devices connected to the computer. You can set the Smart USB Protection function to one of the following modes:

• Disabled (default setting): You can use the USB storage devices without limitation.

• Read Only: You cannot copy data from the computer to the USB storage devices. However, you can access or modify data on the USB storage devices.

• No Access: You cannot access the USB storage devices from the computer.

To configure the Smart USB Protection function:

1. Restart the computer. When the logo screen is displayed, press F1 or Fn+F1.

2. Select Security ➙ Smart USB Protection and press Enter.

3. Select the desired setting and press Enter.

4. Press F10 or Fn+F10 to save the changes and exit.

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