Okay.. so here's the situation. My new HDTV is in the service center because it is mysteriously creating these scrolling lines going up the screen. They are fixing it. So temporarily (because I don't want to move my 360) and I don't want to move my 27inch Sony with s-video that I WAS using downstairs, I am going to use our old 19 inch Sanyo tv that only accepts coax. I have an RF modulator we have used in the past to connect to it with a DVD player. However, for some reason my 360 isn't coming on screen with it. I can hear it through my 5.1 receiver, but no picture. I have the TV on the right channel, I've switched the HD cable from HDTV to regular TV, and I've gotten the composite cables connected to the RF modulator. No picture. Is there a difference in RF modulators?? Any help is appreciated. thanks.