I picked up (for next to nuttin') a "spare" HR10-250 from a friend. It plays back recorded prgrams fine. All xponders test fine on BOTH tuners. Re-ran guided setup, all sats properly detected. Problem is when I go to live TV all I get is a gray screen on both tuners. Existing recordings left on unit playback fine. Can't even get the "barker" channels. Any thoughts? If tuners were bad wouldn't there be a problem with the transponders as well? The box seems to be "stuck" on 6.3B. Could that be the problem?