Filter
Top Products
Troubleshooting Symptom Charts/Startup - 3
Hardware failure
occurs (four-tone
error chord sequence
sounds after startup
chord)
1 Turn off the computer and disconnect any external devices.
2 Reset PRAM (during startup, hold Command-Option-P-R
keys until the second startup tone is heard).
3 Remove expansion module from left expansion bay and restart
computer. If startup sequence is normal, insert expansion
module and retest.
4 Remove expansion module from right expansion bay and
restart computer. If startup sequence is normal, insert
expansion module and retest.
5 Disconnect hard drive connector and restart computer. If
startup sequence is normal, reconnect cable and retest.
6 Replace hard drive connector board.
7 Replace hard drive.
8 Replace I/O logic board.
9 Replace microprocessor board.