resuming the computer from the sleep mode. When resuming the computer from the sleep mode without attaching the external monitor or turning it on, and the computer display remains blank, press F7 to bring up the computer display.

•Problem: The computer does not return from sleep mode, or the system status indicator blinks slowly and the computer does not work.

Solution: If the system does not return from sleep mode, it might have entered sleep or hibernation mode automatically because the battery is depleted. Check the system status indicator.

–If the system status indicator blinks slowly, your computer is in sleep mode. Connect the ac power adapter to the computer; then press Fn.

–If the system status indicator is off, your computer is off or in hibernation mode. Connect the ac power adapter to the computer; then press the power button to resume operation.

If the system still does not return from sleep mode, your system might stop responding and you might not be able to turn off the computer. In this case, you need to reset the computer. If you have not saved your data, it might be lost. To reset the computer, press and hold the power button for 4 seconds or more. If the system is still not reset, remove the ac power adapter and the battery.

•Problem: Your computer does not enter sleep or hibernation mode.

Solution: Check whether any option has been selected to disable your computer from entering sleep or hibernation mode.

If your computer tries to enter sleep mode but the request is rejected, the device attached to the USB connector might have been disabled. If this occurs, do a hot-unplug-and-plug operation for the USB device.

•Problem: The battery discharges slightly while the computer is in hibernation mode.

Solution: If the wakeup function is enabled, the computer consumes a small amount of power. This is not a defect. For more information, refer to “Power-saving modes” on page 24.

Problems with drives and other storage devices

This section includes hard disk drive problems, solid-state drive problems.

Hard disk drive problems

•Problem: The hard disk drive makes a rattling noise intermittently.

Solution: The rattling noise might be heard:

–When the hard disk drive begins or finishes getting access to data.

–When you carry the hard disk drive.

–When you carry your computer.

This is a normal characteristic of a hard disk drive and is not a defect.

•Problem: The hard disk drive does not work.

Solution: On the Boot menu of ThinkPad Setup, ensure that the hard disk drive is on the Boot priority order list. If it is on the Excluded from boot order list, it is disabled. Select the entry for it on the list and press the Shift+1 key. This moves the entry to the Boot priority order list.

•Problem: After setting a hard disk password on the hard disk drive of the computer, you moved the drive to another computer. Now you cannot unlock the hard disk password.

Solution: Your computer supports an enhanced password algorithm. Computers older than yours might not support such a security function.

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Lenovo T431s, 20AA000BUS, 20AA000MUS manual Problems with drives and other storage devices, Hard disk drive 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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