Unfortunately I don't know anyone else with a Mac Pro. But here's the deal. I turned it on and waited for what would be the usual startup time, entered my password, waited a minute, put my iPhone on it's dock, and it's synching. I can't seem to get iTunes to play any music, if in fact it is running, but the iPhone wouldn't sync if iTunes weren't open right? This furthers the evidence that it's the video card, not matter how little sense that makes.
Edit: one more thing, the fan noise was coming from the the fan on the video card. I wonder if I has something to do with the power management or something, but I already tried resetting the SMC.
Edit: one more thing, the fan noise was coming from the the fan on the video card. I wonder if I has something to do with the power management or something, but I already tried resetting the SMC.