NEC DIRECTION SP B - SERVICE 1999, Service And Reference Manual

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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 password (see Section 2, “Setup
Utility”).
Disable password (see Appendix 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 the utility is not selecting a
refresh rate/resolution that is not supported
by the monitor.
Check that the driver used matches the
capabilities of the video controller and
memory.
Wavy display. Check that the computer and monitor are
not near motors or electric fields.
Blank display. Press any key and move the mouse to
ensure power management has not
blanked the display.
Check that the monitor power switch is on.
Check that the monitor cable is attached to
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.