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Lenovo ThinkPad X380 Yoga Manual

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Sleep and hibernation problems
• Problem: The computer enters sleep mode unexpectedly.
Solution: If the microprocessor overheats, the computer automatically enters sleep mode to allow the
computer to cool and to protect the microprocessor and other internal components. Check the settings
for sleep mode.
• Problem: The computer enters sleep mode immediately after the power-on self-test.
Solution: Ensure that:
– The battery is charged.
– The operating temperature is within the acceptable range. See “Operating environment” on page 12.
If the problem persists, have the computer serviced.
• Problem: A critical low-battery error occurs, and the computer immediately turns off.
Solution: The battery power is getting low. Plug the ac power adapter into an electrical outlet and then
into the computer. Alternatively, replace the battery with a charged one.
• Problem: The computer display remains blank after you press Fn to resume from sleep mode.
Solution: Check whether an external monitor was disconnected or turned off while the computer was in
sleep mode. If you disconnected or turned off the external monitor, connect it or turn it on before resuming
the computer from sleep mode. When resuming the computer from sleep mode without attaching the
external monitor or turning it on, and the computer display remains blank, press the display-mode
switching key
to bring up the computer display.
• Problem: The computer does not resume from sleep mode, or the system status indicator blinks slowly
and the computer does not work.
Solution: If the system does not resume 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 has no power or is 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 resume from sleep mode, your system might stop responding and you might
not be able to turn off the computer. In this case, you must 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 four seconds or more. If
the system still does not respond, 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, see “Power-saving modes” on page 29.
Hard disk drive problems
• Problem: The hard disk drive makes a rattling noise intermittently.
Solution: The rattling noise might be heard:
Chapter 6. Troubleshooting computer problems 85
… 103 …


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