Sound has stopped working on 1 account; works ok on another; how to reset?

The sound on my main account has stopped working ....
When I press the volume controls, I get a little "no go" sign and nothing happens
No sound-related applications are working
But when I log in as a different user, sound is working fine
How shoudl I start debugging this one? (it has been working until recently, and I do not think I've installed anything weird...)
Many thanks, Tony

Thinking doesn't help, knowing does. Try this. Create a new admin user account, log into it, set up the sound prefPane as desired, and test that sound works. Open that account's Preferences folder (it's in the account's Library folder), make a list of those preference (plist) files, including those in the ByHost subfolder, log out and back into the problematic account, open up its Preferences folder, and move those list plist files into an empty folder on the Desktop, log out and back in and see if the problem's fixed. If so, then slowly move the moved plists back, log out and back in, and eventually you'll figure out which ones are conflicting or are corrupted. Once that's sorted out, deleted any moved ones remaining on the Desktop.

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