I'm trying to help my parents out. They have an out of warranty Tivo hd xl that recently has (as best as they can describe it) intermittently either a) rebooted itself b) emits what they call a roaring or loud whirring sound that doesn't stop until you power down for 10 min or so c) a combo of a and b. I assumed hd and/ or overheating. I had them run a kickststart smart scan which it passed (after 7 hours). This is on a grandfathered additional plan that I'm not sure they'd transfer over to a new premiere and I'm trying to get out cheap if I can. Suggestions?