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Troubleshooting Symptom Charts/Video - 10
Video
Screen is black, audio
and drive operate, fan
is running, and LED is
lit
1 Adjust brightness on monitor.
2 Replace video cable.
3 Try using known-good RAM SIMMs.
4 Replace video card (if present).
5 Clear parameter RAM. Hold down <Command> <Option> <P>
<R> during startup but before “Welcome to Macintosh”
appears.
6 Replace SIMMs.
7 Replace monitor. Refer to appropriate monitor manual to
troubleshoot defective monitor.
8 Reseat ROM, RAM, and cache SIMMs, and reseat terminator
card.
9 Replace logic board. Retain customer’s SIMMs.
10 Replace power supply.