i have been unable to boot into xp. i have an asus a8n-sli deluxe with an athlon 64 4000+. i have 2 nvidia 7600 gt video cards. i've tried using just one card (tried with both cards seperately) and i've tried using both cards at the same time (switching the two cards). when i try to boot it will boot like normal then before the windows logo the screen goes blank. getting into the bios the same happens. after about 10-15 seconds the screen just goes blank. i've even tried booting with no hard drive. 10-15 seconds later...darkness.