Asus Rampage II Extreme won't preboot Win7

[Vero]

just recieved and started building my new rig based around :

Intel Core i7-920
6gigs of Kingston HyperX DDR3-2000 (KHX200C9D3TK3/6GX)
Corsair 950W PSU
(2) ATI Radeon 4850's Crossfired (waiting on Radeon 5970's to get in stock)
(2) WD Caviar Black 1TB
Coolermaster V8 CPU cooler

I had no issue upon the completion of the build. Win7 installed fine, and everything ran good. After about an hour or so, it would randomly lock up. Low and behold .. the fan on the Coolermaster V8 was not set very high. Changed that, and it ran better, this time the lockups were farther apart. I switched out to the stock Intel cooler, but now, nothing boots past a certain point.

I can leave the PC on at the BIOS, or sitting on a menu and no lockup. The moment I go to load Win7 as either the current install or attempting to reinstall it .. the screen will always lock when it switches to either the loading bar, or the globular Windows startup animation.

Nothing I have done so far rectifies this new problem. I went back down to 1 card, tried all 3 dimms individually... and with that V8 issue, I'm hoping that didnt start the problem. The BIOS is completely set to default, with the memory and CPU on auto

Any ideas?
Part of me wants to say wrong/bad memory .. or board ..

 

[john3850]

Try F8 select enable low res viedo 640x480.
If it works change drivers
Had to use it many times with 2 viedo cards.

 

[lopri]

I can leave the PC on at the BIOS, or sitting on a menu and no lockup. The moment I go to load Win7 as either the current install or attempting to reinstall it .. the screen will always lock when it switches to either the loading bar, or the globular Windows startup animation.

This is typically an issue related to drivers, although I wouldn't rule out hardware completely. Can you see if you can boot into Ubuntu LiveCD?

http://www.ubuntu.com/

Download an ISO and burn it, then set the board's boot order accordingly. If your system boots into Linux, then it's definitely the drivers.

Oh and welcome to AnandTech Forums.