We're glad we were able to help.....Happy gaming
Just now the same thing happened to me. After installing a new game the sound also went off. I have the PS3 hooked to a Sony Bravia M4200 via HDMI. I restored to default settings and the sound came back on after I turned off and on the TV. Apparently both devices have to be "rebooted" in order to regain sound. Wierd.
Hey guys good work on the self trouble shooting very comendable.
Always try the sound settings in the settings menu, as this is always a good place to start.
Also leave the restore default settings for a last result as it will remove things from your console like your network setup and PSN sign in details.
Can be annoying.
My sound went off while I was playing BF3. At first I thought it was just Battlefield 3 being a dumb glitchy game but it turned out my saved avi movie files were not working either. My South Park episodes were on mute. I tured it off for about 30 minutes to an hour and when it came back on my sound was working.
Sooo... I dont know... I have had my playstation for about 5 months, my other playstation I got like 5 years ago still works fine so I am hoping I wont see this problem again. Maybe I shouldnt play my playstation 18 hours a day lol. Nah my other playstation had more life in it than my honda, game on!