No Audio Pref in /Library/Preferences/Audio

Hello
I have no sound in iChat and can not change the settings in Sound Pref Pane. I read the tips about deleting the files in /Library/Preferences/Audio
My problem is, they don't get built anew.
Any idea?

I have the same issue, my system sounds don't work!
Solutions that I see in the threads and don't work:
1. Check the System Preferences > Sounds > Play user interface sound effects;
2. My volume in "Alert Volume" was in the high level possible;
3. I Delete the /Library/Preferences audio relative files and restart SEVERAL TIMES;
4. PRAM 4 times and nothing;
5. Snow Leopard Cache Cleaner and nothing.
6. Seems that nothing work
The another sounds, like youtube playback and iTunes, QuickTime are all work normally, but the system sounds not.
I try everything! I even reinstall the 10.6.4 update combo with no sucess, please someone help me! All the system sounds: empty trash, move documents, remove application from dock... all that system sounds don't work, only the volume up volume down thing.

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