Lenovo ThinkPad L450, User Manual

Page: 111 / 186

If a power-on password is set, press any key to display the prompt for the power-on password and
then type the correct password and press
Enter .
If these items are correctly set, and the screen remains blank, have the computer serviced.
• Problem : When I turn on the computer, only a white cursor is displayed on a blank screen.
Solution : If you have modified a partition on your hard disk drive by using partition software, information
about that partition, or the master boot record might have been destroyed.
1. Turn off the computer, and then turn it on again.
2. If you still see only the cursor on the screen, do the following:
– If you have used the partition software, examine the partition on the hard disk drive by using the
software, and recover the partition if required.
– Use the recovery solutions to restore the system to the factory default state.
If the problem persists, have the computer serviced.
• Problem : My screen goes blank while the computer is on.
Solution : Your screen saver or power management might have been enabled. Do either of the following:
– Touch the TrackPoint pointing device or the ThinkPad trackpad, or press a key to exit the screen saver.
– Press the power button to resume the computer from sleep or hibernation mode.
Beep errors
Table 5. Beep errors
Problem Solution
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep Make sure that memory modules are installed correctly. If
they are, and you still hear the beeps, have the computer
serviced.
Three short beeps, pause, one short beep, pause, one
more short beep, and three short beeps PCI resource allocation failure. Power off the computer
and remove the device from the ExpressCard Slot. If the
beeps persist, have the computer serviced.
Four cycles of four short beeps Shut down the computer immediately and have the
computer serviced.
One long and two short beeps The video function has a problem. Have the computer
serviced.
Five short beeps, pause, Five short beeps, pause
The Security Chip has a problem. Have the computer
serviced.
Five short beeps The system board has a problem. Have the computer
serviced.
Memory module problems
Print these instructions now and keep it with your computer for reference later.
If your memory module is not operating properly, check the following items:
1. Verify that the memory module is installed and seated correctly in your computer.
It might be necessary to remove all added memory modules to test the computer with only the
factory-installed memory modules, and then reinstall the memory module one at a time to ensure
a proper connection.
2. Check for error messages during startup.
Chapter 8
.
Troubleshooting computer problems
95