Is there any way to check/test if my ati 1900 is completely dead? I'm running it in a Intel 3ghz mac pro. And the display will not wake up, and is giving me the 3 quick blinks. I have thrown in a spare low end card and it works fine, but if I switch cable it back to ATI it goes asleep. Just don't want to go and spend the $ on new one if I don't have to, any help is appreciated!