Apple quadra 800.ws 80 Service Manual

 

 Troubleshooting

Symptom Charts - 6

 

Screen is black, audio 

and drive operate, fan 

is running, and LED is 

lit

1 Adjust brightness on monitor.

2 Replace monitor.  Refer to appropriate monitor manual to 

troubleshoot defective monitor.

3 Replace video cable.

4 If video interface card is installed, move it to different slot.

5 Replace video card, if installed.

6 Clear parameter RAM.  Hold down <Command> <Option> <P> 

<R> during startup but before “Welcome To Macintosh” 

appears.

7 Replace SIMMs.  

8 Replace logic board.  Retain customer’s SIMMs.

9 Replace power supply.