i recently bought a radeon hd 5670 and whenever i boot up with the card my monitor is completely black , ive tested different things, installing drivers, adjusting voltage settings, but i can't get this card to work at all. my previous card works fine on the computer (crashes in games with nvlldmkm.sys error though, which is why im switching to a new card). anyways, is it possible that my motherboard does not support 2.1? my motherboard is around 4 years old with the last update being in 2008 and it cant be my psu because that is new with 550 watts.