Lenovo G400 User Manual page 34

Chapter 4. Troubleshooting
Other problems
Your computer does not
respond.
The computer does not
start from a device you
want.
The connected external
device does not work.
30
• 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 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.
• See the Boot menu of the BIOS setup utility. Make
sure that 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. Make sure that the device
is included in the Boot menu in the BIOS setup
utility correctly.
• While turned off, press the Novo button to select the
device you want the computer to start 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
an external device power adapter. Otherwise, the
device may not be recognized, or system shut down
may result.