I had an occasion where I lost my picture. My Direct TV DVR is the signal source. I still had program menu. I re-booted the DVR and regained my picture. Like I said, probably not your issuse, but it doesn't hurt to share. Good luck!
I was watching a HD channel the other night and switched to a standard def channel and my picture disappeared. The screen has a light orange color now. All the channels are like that. The audio still works, and the menu still comes up, just no TV image. DVD player comes through with component cables ok. My hook up is an SA 8300HD box through HDMI cable. I tried connecting it through the side input, but no image. The side input worked fine with my digital camera though. I don't think its the cable box since the channel info and everything else seems to work on the box, but I'm going to swap it out tomorrow anyway to make sure. Any ideas on what is wrong or needs to be replaced? The main board was replaced 5 weeks ago. Since then, a few times I've lost the picture or had a picture that looked like an x-ray when going from a 1080 to 480 res. channel. When I'd change channels it would go back to normal. Any thoughts are appreciated