Apple Performa 6400/180 - Manual (Page 94)

Troubleshooting Symptom Charts/Miscellaneous - 20
computer.
Miscellaneous
No audio, and no drive
operation
1 Connect power cable.
2 Switch power on.
3 Replace power cable.
4 Replace logic board. Retain customer’s DIMMs.
“Sad Macintosh” icon 1 Start up from known-good disk.
2 Replace RAM DIMMs on logic board.
3 Replace logic board. Retain customer’s DIMMs.