No Sound in Leopard on G4

I remember using iTunes and iChat audio chat yesterday. Today I booted up my computer and I couldn't get any sound. In the System Preferences it says there are no input or output devices found. How do I fix this?

I've had Leopard installed since the release day on my MDD dual 1.42 G4
Sound problems have increased to the point to wher I have no sound except for a short time after reboot.
Startup chime is OK, many PRAM zaps, etc.
As soon as I use an app, the sound disappears.
This is from internal speakers or line out.
Sound control panel is functional, but has no effect on zero sound output, no matter what the setting.
Volume control works once or twice.
If I fire up iTunes first, sound is VERY choppy, then cuts out completely.
Works OK from my 10.4.10 boot disk, so I don't think it's hardware per se.
I've also tried deleting some prefs that are rebuilt at boot, and disabling Time Machine, as I though that may be the culprit.
No go...
Any insight, anyone??

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I have just bought a iBook G4 & have upgraded it to Leopard with after the software update is now running 10.5.4
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Thanks

Hi dazchelt and welcome to Apple Discussions.
There seems to be quite a few people with this problem over on the Leopard forum with no definitive answer (not that I have found, anyway)
However, if you haven't already, try a restart or two.
Then try Starting up in Safe Mode.
Safe Boot takes longer than normal startup.
Then do a normal restart.
If that doesn't work try Resetting PRAM/NVRAM.
If that doesn't work try Resetting the Power Management Unit (PMU).
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Is it true that Leopard doesn't support the iSight?
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Message was edited by: Sorry, I didn't mean to post in this thread. Quicktime is working fine for me. My apologies.

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1. with 10.5.1 and Mainstage 1.0.2 I had a pretty **** solid setup, since the 10.5.2 update I'm getting crazy cpu spikes all over the place and its basically feeling a lot less reliable. My advice, if you're using Mainstage for gigging, hold of on the osx update, I'm prob gonna have to roll back. You'd think Apple would test this sorta thing especially on their own programs!
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3. I've read that AirPort screws up the CPU. Can you disable AirPort and test again?
4. Not only 10.5.2 but all of leopard, I gave up stripped everything of my mac book pro and reinstalled Tiger, Logic and Mainstage. It took 4 hours to do but I at least stable now
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They are turning into what Steve Jobs called Microsoft
"A third rate software company"
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ejdelafe wrote:
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dt

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