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• Turn off your computer by pressing and holding the power button for four
seconds or more. If the computer still does not respond, remove the AC power
adapter.
• Your computer might lock when it enters sleep mode during a communication
operation. Disable the sleep timer when you are working on the network.
I need to start the computer from a connected device, but the device does
not appear on the boot device list.
Check the boot mode setting in the BIOS setup utility. If the Boot Mode is set to
UEFI, make sure that the device or the medium in the device supports UEFI boot.
If the device or the medium in the device does not support UEFI boot, set Boot
Mode to Legacy Support. If the device still does not appear in the boot device
list, replace with a new device or medium.
The connected external device does not work.
Ensure that:
• The external device is connected by USB cables while the computer is turned
on; otherwise, your computer might be damaged.
• When you are using a high-power-consumption external device such as an
external USB optical drive, ensure that you use the power cable that comes
with the external device. Otherwise, the device might not be recognized, or
the computer might be turned off.
For more technical support information, go to:
http://www.lenovo.com/support
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