@Bodhesatva
The problem sounds like it is with your hdmi cable.
buy a new one for no more than $10, as they are all essentially the same. then go to system output settings and set it to hdmi again- if you havent already.
I believe the PS3 may strain the usage of hdmi more at certain times, meaning that it would cause it to fail predictably.
everyone knows that to turn the system off, you have to hold the reset button for 5ish seconds. But as these guys previously stated, if you hold down the reset button when turning the system on, it will reset the output to AV, and almost always solve your problem.
@munkeh, hope everything works out for you, that sounds like a much more serious problem








