Apple WS 7250/120 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" 

appears.

3 Reset Cuda chip. (Refer to The Cuda Chip in Basics for 

instructions.)

4 Reset logic board. (Refer to Resetting the Logic Board in 

Basics for instructions.)

5 Replace monitor cable.

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

time to test. Replace any bad DIMMs.

7 Test with known-good monitor. Replace monitor if 

necessary. Refer to appropriate monitor manual to 

troubleshoot defective monitor.

8 Replace logic board. Retain customer's DIMMs.