Apple macintosh ii.iix.iifx Service Manual

 

 Troubleshooting

Symptom Charts/System - 3

 

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 Replace power cord.

4 Check batteries. Refer to “Battery Verification” in 

Additional Procedures.

5 Replace power supply.

6 Replace logic board. Retain customer’s SIMMs.

Clicking, chirping, 

or thumping

1 Remove additional NuBus cards.

2 Replace power supply.

3 Replace logic board. Retain customer’s SIMMs.