Beep Errors; Memory Problems; Networking - Lenovo ThinkPad Edge E420 User Manual

Solution: Your screen saver or power management may be enabled. Do either of the following:
– Touch the TrackPoint or the touch pad, or press a key to exit the screen saver.
– Press the power switch to resume from sleep (standby) or hibernation.

Beep errors

Table 7. Beep errors
Problem
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep
One long and two short beeps
Five beeps

Memory problems

Print these instructions now and keep it with your computer for reference later.
If your memory is not operating properly, check the following items:
1. Verify that the memory is installed and seated correctly in your computer.
It may be necessary to remove all added memories to test the computer with only the factory-installed
memories, and then reinstall the memory one at a time to ensure a proper connection. For the
procedures to remove and reinstall a memory, refer to "Replacing memory" on page 93.
2. Check for error messages during startup.
Follow the appropriate corrective actions for Power-on self-test (POST) "Error messages" on page 133.
3. Verify that the latest UEFI for your model has been installed.
4. Verify the proper memory configuration and compatibility including the maximum memory size and the
memory speed.
For details, refer to the instructions in "Replacing memory" on page 93.
5. Run diagnostic test. See "Diagnosing problems" on page 131.

Networking

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 properly.
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.
– You are using the correct device driver.
For Windows 7:
1. Click Start, and then click Control Panel.
138
User Guide
Solution
Make sure that memory modules are installed correctly. If
they are, and you still hear the beeps, have the computer
serviced.
The video function has a problem. Have the computer
serviced.
The system board has a problem. Have the computer
serviced.