Back when it was new, I upgraded the stock hard drive in my Series 3 (648) to a 750gb WD drive. It's been doing great ever since...until now. I just came back from a business trip, and found my S3 in a reboot loop. It never gets past the Welcome, Powering Up screen before the screen goes black, and starts all over. My initial assumption was drive failure, but I've removed the drive and run some WD diagnostics, and everything comes back fine. I've also dusted off the original 250gb stock drive, installed it, and I'm getting the same reboot loop. Based on these results, I'm assuming I've got a different problem besides drive failure, but I'm at a loss as to how to proceed. I've got Lifetime service on the S3, so I really don't want to declare it DOA, and I've got a bunch of recordings I'd like not to lose. Thoughts? Ideas? Insights? Random Musings?