Lenovo K2450 Notebook - Manual (Page 47)

Chapter 7. Troubleshooting computer problems 33
Other problems
Print these instructions first.
Your computer does not respond.
Do either of the following:
• 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 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.
The computer does not start from a device you want.
Do the following:
1. Enter the BIOS program.
2. Select Startup → Boot. Ensure that the device is included in the Boot Priority Order list.
3. Press F12.
4. When the Lenovo logo is displayed on the screen, select the device that you want the computer to start
from.
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