•Problem: When I turn on the computer, only a white cursor is displayed on a blank screen.

Solution: If you have modified a partition on your hard disk drive by using partition software, information about that partition, or the master boot record might have been destroyed.

1.Turn off the computer, and then turn it on again.

2.If you still see only the cursor on the screen, do the following:

–If your system is installed with the Windows 7 operating system, use either the Rescue and Recovery workspace or the recovery discs to restore the system to the factory state.

–If your system is installed with the Windows 8 operating system, use either the Remove everything and reinstall Windows function or the recovery discs to restore the system to the factory state.

If the problem persists, have the computer serviced.

•Problem: My screen goes blank while the computer is on.

Solution: Your screen saver or power management might have been enabled. Do either of the following:

–Touch the TrackPoint pointing device or the touch pad, or press a key to exit the screen saver.

–Press the power switch to resume from sleep or hibernation.

Beep errors

Table 7. Beep errors

Problem

Solution

 

 

One short beep, pause, three short beeps, pause, three

Make sure that memory modules are installed correctly. If

more short beeps, and one short beep

they are, and you still hear the beeps, have the computer

 

serviced.

 

 

One long and two short beeps

The video function has a problem. Have the computer

 

serviced.

 

 

Four cycles of four short beeps

The Security Chip has a problem. Have the computer

 

serviced.

 

 

Five short beeps

The system board has a problem. Have the computer

 

serviced.

 

 

Three short beeps, pause, one short beep, pause, one

Power off and remove device from ExpressCard Slot. If

more short beep, and three short beeps

the beeps persist, have the computer serviced.

 

 

Memory module problems

Print these instructions now and keep it with your computer for reference later.

If your memory module is not operating properly, check the following items:

1.Verify that the memory module is installed and seated correctly in your computer.

It might be necessary to remove all added memory modules to test the computer with only the factory-installed memory modules, and then reinstall the memory module one at a time to ensure a proper connection.

2.Check for error messages during startup.

Follow the appropriate corrective actions for power-on self-test (POST) error messages.

3.Verify that the latest UEFI BIOS for your model has been installed.

4.Verify the proper memory configuration and compatibility including the maximum memory size and the memory speed.

5.Run diagnostic programs. See “Diagnosing problems” on page 115.

Chapter 10. Troubleshooting computer problems 119

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Lenovo 20AA000MUS, T431s, 20AA000BUS manual Beep errors, Memory module problems
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20AA, T431s, 20AA000MUS, 20AA000BUS specifications

The Lenovo ThinkPad series has long been a favorite among business professionals and tech enthusiasts alike, and the Lenovo 20AA000BUS, 20AA000MUS, and T431s models exemplify the brand's commitment to innovation, performance, and rugged design. These laptops are designed for enterprise users who require reliability and versatility in their everyday tasks.

The Lenovo 20AA000BUS model features a robust Intel Core processor that ensures smooth multitasking and quick application launches. Paired with a generous amount of RAM, users can easily run demanding applications and simultaneously manage numerous browser tabs without a hitch. The full HD display provides sharp visuals and vibrant colors which enhance productivity, whether one is working on spreadsheets, watching videos, or conducting presentations.

In terms of connectivity, these models boast several USB ports, HDMI output, and an SD card reader, which facilitate seamless integration with various peripherals and external devices. With the inclusion of robust wireless options, including Wi-Fi and Bluetooth, users can stay connected throughout their workspaces and collaborate effortlessly with coworkers.

Security features are a priority for Lenovo, and the 20AA000MUS model does not disappoint. Built with a fingerprint reader and a webcam privacy shutter, users can feel confident in their data safety. Lenovo's Trusted Platform Module (TPM) technology further enhances system security by encrypting sensitive data.

The T431s, a prominent model in this lineup, prides itself on its sleek and lightweight design, making it easily portable for professionals on the go. The carbon fiber and magnesium alloy chassis not only lends to its durability but also ensures that it withstands the rigors of daily travel.

Battery life is another highlight of these models, capable of lasting through an entire workday, which is a significant advantage for users who often find themselves away from power sources. The Quick Charge feature allows for rapid recharging, ensuring that users can quickly power up their devices before heading into meetings or events.

Overall, the Lenovo 20AA000BUS, 20AA000MUS, and T431s represent a blend of advanced technology, user-centric design, and robust security features. They stand out as reliable companions for professionals seeking efficiency and performance in their computing devices. Whether in the office or on the move, these laptops meet the demanding needs of the modern workforce.
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