51" Hitachi issue? Or not?

[PS34EVER]

My buddy just bought a 60 gig PS3. He has it hooked up to a Hitachi 51f59 51 inch 1080i Rear Projection TV with a Belkin HDMI cable. Shortly after he bought it, he started to have picture problems. Sometimes the screen gets very bright, sometimes it get very dull. Sometimes it has a terrible picture quality where you can hardly recognize what's on the screen. He thought it was something wrong with the PS3, so he brought it back and exchanged it. When we got it hooked up, it started doing the same thing again. I HIGHLY doubt it is two bad PS3's. What are the odds of that? I think I have a better chance at getting struck by lightning.

I am wondering, maybe it's his connection from his TV where the HDMI plugs in, or maybe it's a bad cable. Does anyone know what might be up? Thanks!