Apple Mac 8600 - Manual (Page 75)

Troubleshooting Symptom Charts/Video - 12
Screen is black, no
boot tone and drive
does not operate, but
fan is running and
LED is lit
1 Reset Cuda chip. (Refer to The Cuda Chip in Basics for
instructions.)
2 Reset logic board. (Refer to Resetting the Logic Board in
Basics for instructions.)
3 Remove all DRAM DIMMs and try replacing them one at a
time to test. Replace any bad DIMMs.
4 Replace processor card.
5 Replace logic board. Retain customer's DIMMs.
6 Replace power supply.