[thechris]

Honestly, it could be anything at this point. 9/10, I've found that it was due to a bad stick of RAM. However, you've done a factory restore as well as swapped out each stick of RAM. Did you just do a mem test on the sticks or did you actually remove one stick and manage to get it to boot? If it wouldn't boot when only one stick is in (although I've seen this happen), it could be that you simply have a bad stick. Are they both showing up during the mem test? Do you have extra RAM sticks kicking around that you can try? Try using those sticks and see if you get the same thing. Usually, it's RAM. When it isn't RAM, then I start panicking. There's always the chance that it's your hard drive and your virtual memory file is screwing up. Good luck.