So, this week at some point I didn't detect immediately, my HD-PVR stopped working. I spent hours tonight trying to fix it, with no luck. It would usually just not "beep" in Windows at all when I'd plug it in, and the blue status light on the front would light up dimly.
Sometimes, after unplugging it and re-plugging it, I could get Windows to detect it for a few minutes, but it would show up as an unrecognized device and I couldn't get it to go any further (and it would usually vanish after a minute or two and the blue light would dim again).
I was a hop-skip-and-a-jump from pulling the darn thing out and buying a new one from Amazon, when I found some references online to crappy power supplies included with them. Now, I've had almost no problems with mine since the day I got it (unlike others out there) and mine is a later-model, though not the latest. In any case, I decided to investigate further, since I was pretty convinced it was totally dead.
I dug through my dusty bins, and found another 5v power adapter that had a matching plug. It seems to use the same adapters that are common for cheap desktop switches and whatnot. The one I found was for an old Vonage router. In any case, it worked! The thing roared back to life and is working fine. Apparently if you call Hauppauge, they'll send you a free replacement without much trouble, so I think I'll call them tomorrow.
So... Word to the wise... If you have a HD-PVR, and it suddenly dies on you, you might want to check the power supply.