Thanks for the update. While I would love to be able to try some of these things, my computer has apparently bricked. I have outstanding RMA offers on my video card, RAM, and CPU but let me back up a bit.
Yesterday I tried to turn it on and it wouldn't (this was after I just shut it off after a BSOD the previous night). There was no sound, no light, no nothing. I'd press the power button and nothing happened. I assumed it was probably the PSU since it was the only component in my machine that hadn't been replaced since I originally built it (Summer '04) and at 420W, wasn't exactly designed to work efficiently with most of the parts in my machine. I went out and bought a 650W one, and began the installation process.
Halfway through, I noticed the heatsink/fan on my CPU (the stock one that came from my E8400) wasn't properly seated and was loose on the side closest to the top of the chassis. Noting the fact that a previous reply here said the error could be temperature related, and knowing that this CPU has had a tendency to run quite hot since I originally bought it, I figured that the CPU had failed. To be perfectly honest, I'm not even sure how long the heatsink had been seated like that. For all I know it could have been like that from the day I installed it. I had read on other forums that the E8400s had a tendency to run hot so I just assumed that it was an issue with the stock cooler.
I had called Intel a few days prior and they offered to RMA it if I applied some more thermal paste and it was still running hot. Obviously, I didn't do so, but I'm going to say that I did, and forget to mention the not properly mounted thing. The reason I believe it's the CPU is that the motherboard IS getting power because the indicator LED is lighting up. If it wasn't the PSU, big deal, it needed to be replaced anyway, and now at least if it wasn't I have a spare.
Edit: Forgot to mention that after installing the new PSU, the system, obviously, still would not turn on. I've gone through massive amounts of troubleshooting and tried every step imaginable, but it still won't turn on, that's why I've narrowed it down to the CPU.