Apple imac 17in 1ghz 서비스 매뉴얼
iMac (17-inch Flat Panel, 1GHz) Troubleshooting -
Sound Out Symptom Charts
Sound Out
No sound from either internal or external speakers
1.
Verify volume setting is correct in system preferences.
2.
Replace the external speakers or headphone in question with a known-good device.
3.
Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh”
appears.
4.
Verify internal speaker cable is connected.
5.
Replace the internal speaker.
6.
Replace the logic board.