Apple color classic Service Manual

 

 Troubleshooting

Symptom Charts/Miscellaneous

 

 (Continued)

 

 - 18

 

“Sad Macintosh” icon

1 Replace bad disk with known-good disk.

2 Replace RAM SIMMs on logic board. 

3 Replace logic board. Retain customer’s SIMMs, math 

coprocessor, and PDS card.

Screen shows “Sad 

Macintosh” icon and 

black vertical lines; 

screeching sound

1 Replace RAM SIMMs on logic board. 

2 Replace logic board. Retain customer’s SIMMs, math 

coprocessor, and PDS card.