I have a Tivo HD w/ lifetime subscription. I bought it used a couple of years ago... but I know the person that had it and they really never even set the darn thing up. It was for all practical purposes new. I immediately updated it to a 1GB drive and stored the original away in a safe place. Yesterday the drive seemed to start acting up. I got 2-3 reboots... then this morning it was a cyclic reboot. I forced a green screen on it... and it went cyclic before the green screen should have finished. I RMA'ed the drive (still under warranty) and fetched the original. I put the original in and it worked fine. I forced a few connections to tivo and forced a reboot (it said it had updates pending a reboot) to get it going and all seemed right with the world. 6 hours later, it's cyclic. Sometimes it gives "welcome, powering up" and sometimes it falls back to a fast blinking green LED -- no video out. Reseting the power seems to get it back to Welcome. Ideas?