PS3 troubleshooting

[Bodhesatva]

My cable box is working fine through a coaxial input. I don't currently have anything else to try, but that tells me everything is fine. 

The most telling thing is that the HDMI didn't just fade out at random intervals (which would suggest the TV is the problem), but ONLY when the PS3 was loading menus and such. I used the AV cables to plug the PS3 into the other TV.  This combination worked fine a week ago. 

Still, it's an odd problem. Never really heard of anything like it.