I just received my new mac pro today. Hooked it up, happy as a kid in a candy store..... plugged it in, turned it on. I see the apple logo, then the screen goes "dead" and i hear the computer say english. I have tried both of my monitors and two different cables. Monitors are just some viewsonic 20" models(dvi) is it not compatible with my monitors or is the card dead? I don't understand how it can display the apple logo then loose its signal. Any and all help is appreciated.