Issues - PC wont boot now

[The Mailman]

pc specs in sig

so i get everything working (booted into vista after doing the build), 1 graphics card in and all my ram. i so add the 2nd for th sli and plug it all in again.....1 beep on boot, then the motherboard company logo screen goes on..when that happens, i get 2 very quick beeps and i just get a black screen with the blinking "_" (underscore) and nothing else

tried every combo of ram possible, so they are fine

took out the 2nd video card for the sli....same result

what next? what the hell happened?

 

[The Mailman]

okay, when booting up it says an error has occured, blah blah start windows normall. there is a quick BSOD and then the reboot occurs.

i can boot into disk though. i ran a system repair and it turned up nothing. i can rule out video error since all this is working.

windows memory diagnostic revealed nothing...

gonna reinstall vista i guess....