Lenovo ThinkPad T540p - Manual (Page 151)

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 7. Beep errors
Problem Solution
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep Have the computer serviced.
Three short beeps, pause, one short beep, pause, one
more short beep, and three short beeps Turn 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 Turn off 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 the instructions 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.
Follow the appropriate corrective actions for power-on self-test (POST) error messages.
3. Verify that the latest UEFI BIOS for your model has been installed.
4. Verify the proper memory configuration and compatibility including the maximum memory size and the
memory speed.
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.
The network cable must be securely connected both to the Ethernet connector of your computer and
to the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is
100 meters. If the cable is connected and the distance is within acceptable limits but the problem
persists, try a different cable.
Chapter 10 . Troubleshooting computer problems 135