My R15-500 had black screen this morning. Had to reformat to get it back. A weird thing happened last night. I was watching my R11 and the picture went blank for a second and then returned to normal. At the very same time, my wife was watching on our Samsung and her picture went blank and stayed blank. Had to change to another channel then back to the original program to get it back. The R15-300 in another room seemed okay, it was on, and seemed okay. The R15-500 was on, but the TV was off, and it wasn't until this morning I found the black screen. Power spike perhaps? Any thoughts? No, I don't have a UPS.