What does the sound card do.
Is there a separate sound card.
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It handles your audio input/output and processing.
On your laptop, I believe the sound card is built into the logic board.
Depending on your issue, it may be something other then the logic board. For example the microphone cable in step 46
iBook G4 14" 933 MHz-1.33 GHz Logic Board Replacement not being seated would cause microphone issues.
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