Motorola 660AV - Manual (Page 26)

Troubleshooting Symptom Charts/Video - 8
Video
Screen is black, audio
and at least one drive
operate, fan is
running, and LED is
lit
1 Adjust brightness. See Adjustments chapter in appropriate
monitor manual.
2 Check cables.
3 Verify that monitor is switched on.
4 Clear parameter RAM. Hold down <Command> <Option> <P>
<R> during startup but before “Welcome To Macintosh”
appears.
5 Replace video cable.
6 Replace monitor. Refer to appropriate monitor manual to
troubleshoot defective monitor.
7 Replace video card, if present
8 Replace SIMMs.
9 Replace logic board. Retain customer’s SIMMs.
10 Replace power supply.