I received my MacBook Pro yesterday and it wouldn't boot. It beeped 3 times. It turned out that 1 of the memory sticks was bad and Apple replaced it in the Apple store. So it seemed to be ok, but I decided I'd try to test out the 2nd graphics processor by switching to it and running UT2004. I entered a level and flew around a little while and the screen went black and I had to force a reboot with the power button. I restarted and tried the same thing again- and again it crashed! So now I'm thinking that I might have bad video memory too. Has anyone had any similar experiences? Is there something that can test the video memory of the second graphics processor?