Apple 5420/180 Manuale Utente

 

 Troubleshooting

Symptom Charts/Miscellaneous - 26

 

Screen shows “Sad 

Macintosh” icon and 

black vertical lines; 

screeching sound

1 Replace DRAM DIMMs on logic board. 

2 Replace logic board. Retain customer’s DIMMs.

Rattling sound at 

startup in system 

with Apple External 

Video Connector

Press or fold Apple External Video cable to prevent it from 

contacting fan blades.

Headphone jack does 

not operate correctly

1 Verify that headphone jack is seated properly.

2 Replace front panel control board.

3 Replace chassis/wiring harness.