I just got a refurb 5003 for XMas (woohoo!). I hooked it up and everything seemed fine until, I changed channels and my cable box changed from 720P to 1080i. At this point I lost all picture. I then changed from analog to digital, to HD channels and the 5003 would display the pic on some, not on others. There was no consistency with what it would or would not display. It really did not like the change in signal from the cable box. The cable box is hooked up by HDMI to the 5003 which goes HDMI to my TV. Has anyone else had the same problem or does anyone know what may be causing this issue? Also the remote will change volume and perform a few other simple functions but it will not bring up the Menu etc. Please Help! thanks