Series 3 reboots randomly, then hangs on Welcome screen
I've got a TiVo series 3, upgraded with an 750gb external drive added via eSATA (enclosure is Antec MX-1, drive is Seagate but I forget which model number- supposedly it's rated for 24/7 use). The setup has worked fine since I did the original kickstart 2 years ago.
Recently, randomly (both watching live or recorded TV), TiVo will reboot itself, then hang on the Welcome, Powering Up screen. If I pull the cord, the next reboot is always successful, but it seems to be rebooting again every couple hours. I suspect it's a hard drive issue. A few questions:
1) Any way to confirm this is a hard drive issue and not something else?
2) Can I extract anything shows from the external drive if I need to divorce them for troubleshooting purposes? How would I do this?
3) I'm assuming once I divorce them I'll lose everything recorded. Is there anything else I should try before I pull the external and divorce the drives?
I appreciate any information anyone can provide, answering these questions or with any other general help.