Well, I have no one to blame but myself... I did the Mute,1,8,2,Power to get service mode open, hoping to find a way to fix a sound issue I was having. I was clicking through everything, and came across AV Calibration. I didn't realize the right arrow would select it, and pressed it. Bad move. Now I can't receive anything through coax, which is an issue considering I have cable. I've tried running a 8x8 checkerboard and a NTSC test pattern while it calibrates, but to no avail. I'm assuming that if nothing happens after 15 minutes, that's a sign that nothing will happen, right? I fear I may have to fess up to Samsung and pay for a repair, but if you have any suggestions, they are most certainly welcomed. The setup I'm using to get the pattern(s) on the screen is a Wii displaying the images, routed through a VCR to get it to come out through coax. I've verified that the image is in fact being outputted correctly by attaching another TV to set it up.