Apple 9500/150 Manuale Utente

 

 Troubleshooting

Symptom Charts/Video - 11

 

Screen is black, boot 

tone is present, drive 

operates, fan is 

running, and LED is 

lit

1 Adjust brightness on monitor.

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

<R> during startup but before "Welcome to Macintosh". 

3 Verify video card is installed and reseat card.

4 Reset Cuda chip. (Refer to The Cuda Chip in Basics.)

5 Reset logic board. (See Resetting the Logic Board in Basics.)

6 Replace video cable.

7 Remove all DRAM DIMMs and try replacing them one at a 

time to test. Replace any bad DIMMs.

8 Replace video card.

9 Test with known-good monitor. Replace monitor if 

necessary. Refer to appropriate monitor manual to 

troubleshoot defective monitor.

10 Replace processor card.

11 Replace logic board. Retain customer's DIMMs.