There is no external hard drive on this TiVo, but could my trouble be caused by an internal hard drive problem? And if so, just how daunting a task is it to replace the hard drive?
I can't really say for sure, but it certainly sounds like the same symptoms I had. The good news is that, as Bitt mentioned, there are sites that will make the hard disk replacement process as painless as possible for you. The classic site IMO is
Weaknees, which will sell you a drive kit specifically designed for your model, and give you everything you need to do the swap, right down the the Torx keys.
The other good news is that I'd be surprised if you could even buy a hard disk as small as the drive you'll be replacing. For instance, it looks like the smallest recording time you'll be able to order from that site is 180 hours

The glow remote is much better than the standard squishy button one.
Agreed. The glow remote is fantastic. My three favorite features: the lighted buttons (obviously), the quality of the buttons (not to hard/soft, with a satisfying click when pressed), and most importantly - on the back of the remote, the battery compartment is ridged. That might not seem important, but in my experience it eliminates the only complaint I've ever had about the peanut remotes: that I always pick it up backwards
