Okay, bear with me here, as this may end up seeming somewhat complicated, but I'm having an issue with my audio output on my PS3. I have the standard US 60gb PS3 plugged into my Sharp Aquos 32" TV via HDMI cable, and the TV out to my receiver via optical cable.

The problem I have is this, and is weird - the problem is that I don't get any sound out of the optical output of the TV from the PS3, just to the TV speakers, and here's where it gets really weird, the optical output starts working just fine the moment I start to play a Bluray Disc. So it works like a dream, exactly as it should, except for only if it's playing bluray. It won't work for Warhawk, for example, or even for just standard button noise when navigating the PS3 OS. The optical output doesn't even turn on - no red light behind it or anything. When the bluray kicks on though, bingo - power.

Any ideas what might be causing this? The TV's settings aren't really adjustable to fix it, and when swapping to another HDMI input, the problem wasn't solved, so I'm thinking it must be something in the output of the PS3. It seems like it must be trying to output a different audio format for the bluray than it is for anything else, and I can't figure out how to rectify that.

Any help on this one'd be hugely appreciated.