I have a 20" 1.8GHz iMac here at my job... I've been doing some audio work with Garageband and the freeware program Audacity. At one point yesterday, Audacity locked up and ever since then I can't hear sounds played from a Finder window, or in Safari. Strangely, alert sounds work fine, and so does playing music from iTunes, and stuff in Garageband. I've tried adjusting settings in the sound control panel, rebooting, shutting down completely, and even resetting the PRAM and nothing has fixed it. Is there anything else I can try? (short of reinstalling the OS) Thanks for any advice.