Apple performa 400 series 서비스 매뉴얼

Troubleshooting

Symptom Charts/Miscellaneous - 13

Miscellaneous

Clicking, chirping,

or thumping

1 Replace power supply.

2 Disconnect hard drive. Replace drive if noise disappears.

3 Replace logic board. Retain customer’s SIMMs.

System shuts down

intermittently

1 Make sure air vents on back and top of case are unobstructed.

Thermal protection circuitry may shut down computer. After

30 to 40 minutes, system should be OK.

2 Replace power cable.

3 Replace power supply.

4 Replace SIMMs.

5 Replace logic board. Retain customer’s SIMMs.