Powerbook G4 17" speakers dead.

Powerbook 17" G4 speakers suddently died. No sound at all, no chime on startup, no sound through externals, sound selected internal speakers, no internal mic levels. Zapped PRAM of course no 2nd Chime. Sound works with USB I/O device but nothing on internal or external plug. Please help.
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Andrew DuffyTechnical Services CoordinatorCommented:
You've covered most bases. I would only suggest the following because you've not mentioned them specifically:

1. Verify the latest Audio system software update has been installed.
2. Press F3 to ensure mute isn't enabled.
3. Use F4 and F5 to verify the volume level.
4. Check the 'Play alerts and sound effect through:' drop-down box in the Sounds control panel, and ensure it says Internal Speakers. If it doesn't (e.g. if it says headphones), but nothing is plugged in, this implies there is a short in the headphone socket.

If these don't solve it you have a hardware problem, which will require the replacement of either:

a) The sound board flex cable.
b) The sound board.
c) The logic board.
beasleyimpactAuthor Commented:
Thanks Done all this and still no sound. Could be hardware. Is there a testing piece of software to verify hardware isues?
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Andrew DuffyTechnical Services CoordinatorCommented:
Yes, but you've followed Apple's official troubleshooting steps so that confirms it.

It's possible the Apple Hardware Test that shipped with your machine could diagnose the problem, but other than that you would nee the Service Diagnostics CD, which any local Apple Service Provider should be able to run for you.
beasleyimpactAuthor Commented:
Sounds like a plan... Turnaround with my Apple dealer 2 weeks!!! Country Victoria in Australia. Where could I lay my hands on this Service Diagnostics CD? Downloaded the PDF for the 17" and can understand  - simple really. I need a diagnostic though. Have to be a bit self reliant here, soldered the power port on my old G3 clamshell years ago and got 2 more years out of it. They used to break off the mother board. Couldn't revive my tibook though... Damn hinges snapped the logic board. Apple dealer wanted 5k to fix!!!! Thanks.
Andrew DuffyTechnical Services CoordinatorCommented:
5k??? My goodness...

The diagnostics CD can be downloaded from Apple's Service Source website. All you need to do is find someone who has one and is happy to help!

(I'm afraid that's about as helpful as I'm allowed to be, considering the arena...)

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I have the same problem with speakers dying. I did notice earlier today that the speakers were giving a high pitch sound now and again, before dying a short while ago.

Does that sound like a hardware problem ?
beasleyimpactAuthor Commented:
It was definitely a hardware problem, turned out to be relatively common and needed a new logic board. Bloody Mac's, can't live with them and yet...
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