My older Revue seems to be losing the video (audio is fine) from time to time. The TV goes gray then picture comes back on its on after awhile. I have tried control, alt, delete but not much help there. How does one do a 'factory reset' ? What else might I try? By the way my Comcast internet signal is very good. Don't think its a bandwidth issue. My set-up is a DirecTV HD DVR. Thanks!