Apple powermac g3 blue.white 서비스 매뉴얼

 Troubleshooting

Symptom Charts/Video and Sound - 48

Screen jitter

1 Reseat the video card.

2 Replace the video card.

No sound from 

computer’s speaker

1 Boot with a bootable CD and test.

2 Boot with Extensions off and try again.

3 Disconnect any microphones or external speakers.

4 Verify that volume setting in Control Panel is adequate and 

mute is not checked.

5 Clear parameter RAM. Hold down Command-Option-P-R 

during startup, until the Macintosh restarts. 

6 Verify speaker cable (J34) is plugged into logic board.

7 Plug headphones or external speakers into the external jack. 

If the external jack works, replace the internal speaker. If 

the external jack doesn’t work, replace the logic board.