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• Ensure that video resolution is set to less than 1152 x 864.
If these actions do not correct the problem, run the diagnostic programs (see “Diagnostic programs” on
page 107 for instructions). If you need technical assistance, see Chapter 11 “Getting information, help, and
service” on page 109.
Invalid disc or no disc found message
Symptom: Invalid disc or no disc found message
Actions:
• Ensure that a DVD disc is in the drive with the shiny side of the disc facing down.
• Ensure that video resolution is set to less than 1152 x 864.
• On computers that have a CD-ROM or CD-RW drive in addition to a DVD-ROM drive, make sure that the
DVD disc is in the drive labeled “DVD”.
If these actions do not correct the problem, run the diagnostic programs (see “Diagnostic programs” on
page 107 for instructions). If you need technical assistance, see Chapter 11 “Getting information, help, and
service” on page 109.
Intermittent problems
Symptom: A problem occurs only occasionally and is difcult to repeat.
Actions:
• Verify that all cables and cords are securely connected to the computer and attached devices.
• Verify that when the computer is on, the fan grill is not blocked (there is air ow around the grill), and the
fans are working. If airow is blocked or the fans are not working, the computer might overheat.
• If SCSI devices are installed, verify that the last external device in each SCSI chain is terminated correctly.
(See your SCSI documentation.)
If these actions do not correct the problem, run the diagnostic programs (see “Diagnostic programs” on
page 107 for instructions). If you need technical assistance, see Chapter 11 “Getting information, help, and
service” on page 109.
Keyboard, mouse, or pointing device problems
Select your symptom from the following list:
• “All or some keys on the keyboard do not work” on page 95
• “The mouse or pointing device does not work” on page 96
• “The pointer on the screen does not move smoothly with the mouse” on page 96
• “The ngerprint reader does not work” on page 96
• “The wireless keyboard does not work” on page 97
All or some keys on the keyboard do not work
Symptom: All or some keys on the keyboard do not work.
Actions:
• Verify that the keyboard cable is securely connected to the correct connector on the computer.
Chapter 10. Troubleshooting and diagnostics 95