Apple Power Macintosh 7100/80AV - Manual (Page 38)

Troubleshooting Symptom Charts/System - 4
System
Does not power on;
screen is black, fan is
not running and LED
is not lit
1 Check cables.
2 Plug monitor directly into wall socket, and verify that
monitor has power.
3 Reset logic board. (Refer to Additional Procedures.)
4 Reseat ROM SIMM and cache SIMM.
5 Replace power cord.
6 Replace power supply.
7 Replace logic board.
Clicking, chirping or
thumping
1 Replace power supply.
2 Replace logic board. Retain customer’s SIMMs.