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• 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 touch pad, or press a key to exit the screen saver.
– Press the power button to resume from sleep or hibernation.
Beep errors
Table 8. 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.
One long and two short beeps
The video function has a problem. Have the computer
serviced.
Four cycles of four short beeps
Shut down the computer immediately and 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. See “Replacing a memory module” on page 73
.
2. Check for error messages during startup.
Follow the appropriate corrective actions for power-on self-test (POST). See “Error messages” on
page 132.
3. Verify that the latest UEFI for your model has been installed.
4. Verify the proper memory conguration and compatibility including the maximum memory size and the
memory speed. See “Replacing a memory module” on page 73.
5. Run diagnostic programs. See “Diagnosing problems” on page 131.
Networking problems
The following are the most common networking problems.
Ethernet problems
• Problem: Your computer cannot connect to the network.
Solution: Make sure that:
– The cable is installed correctly.
Chapter 10. Troubleshooting computer problems 135