Question about Apple 15" PowerBook G4 Aluminum 1.67 GHz LCD Display (p/n 1002587) (661-3749 1002587) Mac Notebook
Check if there is any sound coming out of the headphone (using headphone and playing itunes).
If there is none. Goto System Preference > Hardware > Sound > Output ; check if the output is assign to internal speaker and it is not muted.
Do a visual check at the headphone connector, look into it, see if you see a red light emit from the headphone jack (indicate that the fault is in the headphone connector, it's trying to output optical spdif).
Posted on Feb 15, 2013
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Posted on Jan 02, 2017
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