Today I've been working on 1 of my PCs with an AMD Athlon XP 3200+ CPU, that I've been setting up on and off over the past year as a 2003-era gaming system.
I hadn't worked on it in a while and had noted some stability issues already. I installed several games today and yesterday and all seemed fine, but then it came time to install Doom 3. Doom 3 installed fine, but wasn't playable, constantly crashing to the desktop after a couple of minutes of gameplay. Halo would also do the same. I ran Prime 95 and it failed with "Hardware Error detected".
Suspecting the CPU may be overheating, I replaced the cooler with a bigger Thermaltake branded cooler from another Socket A/462 system. The CPU temperature is fine, a little cooler, but after a BSOD trying to run Prime 95, it now no longer boots any OS. The new cooler was a little tighter fitting, so I'm beginning to suspect a motherboard issue in the area of the socket itself. Going to have to strip it all down tomorrow and do some further testing out of the case, as well as testing a different PSU. The motherboard I'm using has the 4-pin power, so it gives me a bit more flexibility with regards to more modern PSUs.