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I'm running my mom's Powerbook G4 in Safe Boot Mode because of problems it's been having (trying to get her to get a new macbook). Anyway, the sound suddenly is no longer there. I went into Sys Prefs and clicked on SOund and it says "No output device found." Same for input. I repaired permissions and still nothing. She's running 10.4.11.
Any clue?
Jerry
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Try a new user account or boot from another OS X installation. Do you have sound now?
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Wait. Safe mode? Is sound even enabled in safe mode? You need to boot into the normal OS if you want sound.
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First, ensure that the headphone jack is unobstructed, i.e. nothing is stuck inside the jack.
Next, launch Audio MIDI Setup in your Utilities folder in your Applications folder. Set audio input and output to 44100.0 kHz and 2-ch 16-bit using Core Audio or Built-in Audio.
If you still have no sound output, you can eliminate hardware as the source of the problem by logging into another account and trying sound there.
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"Wait. Safe mode? Is sound even enabled in safe mode? You need to boot into the normal OS if you want sound."
What he said.
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Zap the PRAM. Restart, hold the command - option - p - r down right after it begins to start. Hold the keys down until it chimes three times, then let up on the keys and it will start and you should have sound again.