Dodged that one…
So the problem in my main machine was a hard drive gone bad. Fortunately it was not the important one and it’s even still under warranty.
The Home Server box is still dead, but I found another DDR2 motherboard in my closet that I’d forgotten about completely when I switched to an AM3+/DDR3 motherboard. Now assuming it was the MB and that I can dig up a video card, I’ll be getting complete backups again. (Crossed fingers that nothing else smokes.)
And I’ve got a pile of stuff for Goodwill building. I may just end up with a navigable bedroom again.