Ok, don't have my PS3 right now, but go somewhere in the settings (can't tell cuz i dont have ps3 around me at the moment, think its the video settings, but idk...), and tell it to make the sound thru the RGB connections....
If you want the audio to go from your TV to your stereo (like mine)...
To the nooblet that says get an iPod, I have an iPod and I JUST got a stereo.
It really all depends on what model you have. If you have the nice $200 one from Wal-Mart, you can do a factory reset.
The only other thing that I can say is to keep it unplugged overnight.