Lenovo IdeaPad Y400 User Manual page 34

Chapter 4. Troubleshooting
Other problems
Your computer does not respond.
The computer does not start a
device you want.
The connected external device does
not work.
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To turn off your computer, press and hold the power button for 4
•
seconds or more. If the computer still does not respond, remove the
AC adapter and the battery.
• Your computer might lock when it enters sleep mode during a
communication operation. Disable the sleep timer when you are
working on the network.
• See the Boot menu of the BIOS setup utility. Make sure that the Boot
Device Priority in the BIOS setup utility is set so that the computer
starts from the device you want.
• Also make sure that the device from which the computer starts is
enabled. In the Boot menu in the BIOS setup utility, make sure that
the device is included in the Boot Device Priority list.
• While powered-off, press Novo button to select the device you want
the computer starts from.
• Do not connect or disconnect any external device cables other than
USB while the computer power is on; otherwise, you might damage
your computer.
• When using a high power consumption external device such as an
external USB optical disk drive, use external device power adapter.
Otherwise, the device may not be recognized, or system shut down
may result.