Hi, I am fairly new to macs and I am having a problem, my Mac Pro keeps restarting. I had a quadro FX 4800 video card on it, but it apperently was useless for gaming ( had problems with all the games i tried), so i swapped it for a NVIDIA GeForce GT 120 . I was instructed that once the card was put in i would just have to start up the Mac and download the drivers. But every time i try to start up it just keeps teling me over and over the mac has to restart. Is there some way to fix this? Would having the Mac dual booted with Windows vista ultimate be a contributing fact to this problem, as that starts up but the display is weird and the graphics card doesnt seem to be registered on the system. As i said i am completely new to macs so any hints or help would be massivly apprecaited.