Cremaster, did you ever resolve the problem?
I have the same board with an x2 4600, 4x1gb of gskill rated to run 1.9 to 2.1v. 450w FSP psu.
I've had some issues with the ram. Seems my board doesn't like ram that runs at anything other than 1.8v. I borrowed some 1.8v Adata from a friend, and it worked fine, though it was only 2x1gb. Problem worsens when using four sticks. The board seems to be quite particular about which stick is in which slot too. Sometimes it works seemingly fine for a month, then starts acting up. Just recently, after I finally got all 4 sticks working acceptably for several months, I suddenly had no video signal. Remove one pair of sticks, and it's fine again. Apparently the 2nd pair I got were weak all along.
I tried every ram voltage, but I'd suggest auto, which will default to 1.8. Move up from there. Try different slots. Borrow some 1.8v ram if you can. I'm sure you were getting dual channel? All your standoffs installed? I'm sure you've tried loading failsafe and optimal defaults? All the other bios settings to auto?
I'm getting the 5000 BE, along with 2x2gb of mushkin econo ram @ 1.8v delivered tomorrow. I'm hoping there won't be any more problems, but if there is, it's just about got to be the board, since I've checked the psu.