Hello! I recently purchased a used tivo hd from eBay, which was reported to be "in good, used condition" & functional. Upon getting it all set up on ota digital antenna only, the recordings freeze, do not play & then the tivo begins to reboot. After a few moments on the welcome screen, it flashes over to a blank gray screen with no remote response at all. It must be unplugged to reboot. Any ideas? HDD? PSU? Mobo? I do not wish to shotgun pays until it works as intended. If there's multiple causes for this symptom, I'd prefer to contact the seller to return it & either try another unit or just do an XBMC PC.