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"No output devices found"
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Dedicated MacNNer
Join Date: Oct 1999
Location: 32°50'N, 117°05'W
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I have a G5 workstation in the office that has suddenly lost audio capability. It chimes at startup just fine, but otherwise, no sound will come out of the computer. The user just uses the built-in headphone jacks for output (i.e., not the USB or optical sound ports).
When I look at System Preferences > Sound > Output, it says "No output devices found." Input is the same (only it says "No input devices found", naturally).
Tried resetting PRAM, jiggling a few cables on the inside, but to no avail. Is this a logic board problem?
TIA!
(Tried posting this on Apple Discussions to no avail. Natch.)
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MacNN Member of the Day: 28 June 2001, 7 July 2001
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Administrator  Join Date: May 2000
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How did it lose audio, after a power failure or other unexpected shutdown? I'm thinking that files or directory trees on the HD could be damaged. Audio drivers don't load = no audio devices supported.
Try booting from the Install CD. Do a repair on the HD, then a permissions repair. It doesn't solve all problems, but it's cheap and easy to do.
On the other hand, if audio failed after a big lightning storm, you may be looking at something more serious.
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Dedicated MacNNer
Join Date: Oct 1999
Location: 32°50'N, 117°05'W
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We haven't had any electrical storms or power failures recently, so I think I can rule that out. It was sort of one of those things where the user called me up and said "uh, my music won't play."
I ran Disk Utility from the CD, and ran volume repair. It failed part way through with a Volume Directory problem that it couldn't repair. I ran the permissions repair anyway. Restarted the computer, and ran TechTool. That cleared up the Volume Directory problem.
After all that, though, still no audio. Beginning to wonder if the company's decision to buy AppleCare wasn't so silly after all ...
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MacNN Member of the Day: 28 June 2001, 7 July 2001
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Moderator Emeritus  Join Date: Nov 2000
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I had a similar problem with my Pismo PowerBook, although it was intermittent (restarting a few times would usually clear it up) and it also affected the startup chime. It wouldn't surprise me if it was a hardware issue.
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Administrator Join Date: May 2000
Location: California
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Do you have an external HD or 2nd HD available? If so, do a clean OS install on the spare HD and boot the problem box from that. If audio is now available, then the OS install is damaged on the G5 in question. Not surprising if there had been serious directory damage.
A reinstall in place followed by version updates would be a good bet to solve such a problem.
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Dedicated MacNNer
Join Date: Oct 1999
Location: 32°50'N, 117°05'W
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Thanks reader50, that was an excellent idea. I booted (in FireWire target disk mode) from one of the office PowerBooks, and found that sound worked just fine when booting from another volume. Thank goodness it wasn't a hardware problem.
I'll restore her HD from our office master disk image. It's three hours of file copying, but it will solve the problem.
Thanks again, folks!
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MacNN Member of the Day: 28 June 2001, 7 July 2001
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