Today I stopped by a thrift store I've never been to before, and they had a tower for sale! It's an independent shop and whatever written or unwritten policy that causes St. Vincent DePaul and all of the other thrift stores around here to never sell such things isn't a policy they observe. So I got this for $15.00: Antec case, Asus K8V SE Deluxe (I hoped it was Socket 939, but it's 754) a Thermaltake 480 watt PSU with a 40 amp +5, a 3400+ CPU, a pair of WD PATA hard drives, a BFG 7300 GT 512 AGP card, and a mix of Corsair and generic DDR.
At first it refused to POST, and after much fooling around I removed some of the memory and then it booted up. After more fooling around, I realized that if it had one of the Corsair CMX1024 sticks it would work, but if I put the second one in it would only sit there with the fans spinning with no sound coming from the POST speaker. I tried some other memory and it had no issues. I'm not sure how that Corsair memory ended up in this thing because it seems unlikely that it was working fine then just stopped.
I've never before seen a motherboard with yellow PCI slots.