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Symptom Possible solution
Computer seems
to be locked up
and is not
responding.
Use the Windows Task Manager to close any programs not responding, or restart the
computer:
1. Press the Ctrl+Alt+Delete keys on the keyboard simultaneously.
2. Click Start Task Manager.
3. Select the program that is not responding, and then click End Task.
If closing programs does not work, restart the computer:
1. Press the Ctrl+Alt+Delete keys on the keyboard simultaneously.
2. Click the Arrow button next to the red Shut Down button, and then click Restart.
Or, press and hold the Power button on the computer for 5 or more seconds to turn off
the computer, and then press the Power button to restart the computer.
Error message:
Invalid system
disk or Non-
System disk or
Disk error.
When drive activity stops, remove the disc and press the spacebar on the keyboard. The
computer should start up.
12 Chapter 5 Troubleshooting