On a recent walk I spotted this out by the curb. It has a 760GM-P34 motherboard, 8 gigs of DDR3 and an FX4130 CPU. The hard drive, optical drive, and PSU had been removed. I put my cheapo spare PSU in it, and it powered up without any issue.
Edit: Loading Windows 10, I discovered the problem - on rebooting after an update, it would lock up, and when you hit reset it would reboot, but not be able to detect the hard drive. I thought maybe there was a problem with the drive I used, so I tried another, but the issue persisted. It seemed like a heat issue, so I used a stock copper/heatpipe AMD cooler I have with fresh Arctic Silver, but it still did it. I swapped in an FX 4300 I have, and removed and reseated the RAM, it still did it. I noticed that the northbridge heatsink, which is large and fanless, was pretty hot. I removed the motherboard, popped that heatsink off and cleaned it and reapplied thermal paste, and that finally resolved the issue! Now running Win10 with no issue.
A lot of times when you first start out on a project you think, This is never going to be finished. But then it is, and you think, Wow, it wasn't even worth it. - Jack Handey