My PC's fried. I'm not at home right now, but when I am, there's a good chance I won't be online much for a while.
There's a 9/10 chance it's the motherboard, based on all the circumstantial evidence. Which would mean, when I replace it, I'll want to replace the CPU and memory as well. But hey, if anyone has a spare obsolete 939 mobo, gimme.