Tried changing out video card to radeon video card and it works. But when I put my Nvidia back in im getting a black screen no signal on monitor. I have a MSI 990FXA-GD65 motherboard and a Nvidia Geforce GTX 660 TI FTW 3GB video card. Oh, and i've also updated drivers and flashed my bios to newest version with the other video card plugged in. PLEASE HELP!!!