Maintenance and Troubleshooting 4-7
Problems and Solutions
Problem Symptom Solution
Modem board
malfunction No output from board. Check interrupts (see Appendix C,
“System Resources”).
Check DMA channels (see Section 1,
“Technical Information”).
Keyboard or mouse
malfunction Monitor has prompt, but cannot
input data. Check that keyboard/mouse is plugged in.
Check passw ord (see Secti on 2, “Setup
Utility”).
Disable pas sword (see App en dix C,
“System Resources”).
Replace keyboard (or mouse).
Replace system board.
Monitor malfunction Unable to synchronize display. Adjust the monitor’s synchronization
controls.
Check that the monitor’s resolution
matches the video setting or the video
driver used.
Check that t h e utility is no t selecting a
refresh rate/resolution that is not supported
by the monitor.
Check that t h e driver used m atches the
capabilities of the video controller and
memory.
Wavy displa y. Check that t h e computer and m o nitor are
not near m otors or el ectric fiel ds.
Blank display. Press any key and move the mouse to
ensure power management has not
blanked the di splay.
Check that t h e monitor power switch is on.
Check that t h e monitor cabl e is attached t o
the video connector at the back of the
system.
Check cable connections between the AC
power supply and monitor.
Adjust brightness and contrast controls on
the monitor.
Check connections between the monitor
connector and the system board.
Replace system board.
Replace monitor.
CD-ROM/DVD drive
malfunction System power not on. Turn system power on.