xbox 360 optical out problems??? Plez help 5 dollA!

Ok SO, I know the cable works because on the ps3 it works just fine

but when I plug it into the 360 from the hd av cable------> receiver there is no sound

in the options its set to dolby digital 5.1 so i know thats right, no sound what so ever.

Im using a av hd component cable going to my tv and then the optical to receiver,

could it be that the av is bad? its a pelican and has worked fine for over a year just recently got surround.

just wondering - have you tried plugging the normal stereo plugs from the AV Component cable into the back of the TV or your receiver?

If you get sound from them then it sounds like it may be the optical plug itself in the AV Component cable which has gone..... (which is a bummer....)