I have recently purchased one of the new 12 core mac pro's. I opted for the 5770 graphics card and 2.66ghz processor. It has been running fine for the past month, but all of a sudden (tonight) the screen just goes black, the computer is still on and the monitor is still on, but nothing happens. I've waited for a few minutes and still nothing is happening. I know you will say to contact apple, but it is 8:30pm so that isn't an option right now. I was hoping that someone knew of this issue or of a way to fix it? I have read other posts that seem to have a similar problem, but they are either using mini dvi, 5870 graphic card or the black goes away eventually.. I'm pretty sure I'm using AVG to DVI adapter (if my memory is correct). Thanks for any help. I'm very anxious, so any response is appreciated!