My Mac Pro all of a sudden started regularly crashing. I have to do a hard reset. When I turn it on, sometimes it'll stay on the gray screen forever, other times it will load and crash eventually. When it crashes while I'm on it, my black desktop background will turn green and simply freeze. See video here (it has already crashed during the screen saver, about 15 minutes after the time shown. It does not flicker like that if it freezes outside the screensaver): http://youtu.be/bV8t9ben55s My guess is my video card is starting to toast. I'm really hoping it's not the logic board. But if either one was toasted, would the computer not function at all, not just crash at random times? Mac Pro specs: 2 x 2.8 GHz Quad-Core Intel Xeon 6GB RAM 1TB HDD NVIDIA GeForce 8800 GT 16x SuperDrive with double-layer support (DVD±R DL/DVD±RW/CD-RW) AirPort Extreme wireless networking Is there a way I can figure out what's wrong without bringing it in to a store? It sucks to lug around. And my Applecare is expired. Any input is appreciated. Thanks!