My sound sometimes goes off completely - possibly after computer wakes up.

The problem is that the sound sometimes seems to turn itself off completely, through speakers and headphone socket, with no system sounds. My iTunes etc. will play, but no sound.
I previously thought that sometimes it happened after turning the computer on, but now I'm noticing it happens sometimes after my computer has been asleep, and a restart is required to get the sound back.
Any ideas if it is a sound card issue, or software? A known problem?
Thanks

I have the same problem on my g5. In my case it started after my wife had an "over-zealous" plant watering incident that drenched the entire machine and I actually had to turn it upside down to dump water out. It is intermittent like you say, and a restart always fixes it. I have noticed though that when using the volume keys to turn up the volume when this happens, that the icon is different to somehow indicate there is no sound.

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