10.4.7 update cuts sound output on iChat

Since 10.4.7 update to our family's machines, (two macminis intel core duo 1.66 GHz, one mac powerbook 800 power pc g3) we've lost the sound output completely on iChat. We can't hear callers although we can see them, but also we can't hear alert sounds like ringing etc when logging in and out.
I checked the audio MIDI Setup and it's at 44.
I've repaired permissions.
Is there any way to uninstall a system update? I really wish I hadn't taken it. I've had iChat since the beginning and never had any problems.
Can anyone make any suggestions to help?

Hi Janice,
Glad to hear.
Hint time
New Discussions ReponsesThe new system for discussions asks that after you mark your question as Solved. You should take the time to mark any posts that have aided you with the tag and the post that provided your answer with the tag. This not only gives points to the posters, but points anyone searching for answers to similar problems to the proper posts.
Alternatively, you can change the status to Answered.
If we use the forums properly they will work well...
12:07 AM Wednesday; July 12, 2006

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