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Question: My Sound doesn't work at all.

This happened after i pressed start on a UBISOFT commercial before i came to the game menu ( By the way the Game this happened on is Prince of Persia). Coming to the Menu the sound was glitchy and it got worse when i started the game. A few moments in, the sounds off completly. I restarted the Playstation and found that not even the little tune that plays when you turn the ps3 on worked. I even tried to play PoP agian - though there was no sound. I'm clueless as to what has happened. Any ideas?