OK, I had decided it was time to blow the dust out of the good old mac pro.... I popped the side off and used canned air to clean it out. While i was in there, I decided to change out the drive in my #4 bay.... When I was putting it back IN, I didn't align it correct, and I bummped a small button on the mainboard... Its on the top right section of the board, directly under drive bay 4. I thought at first this might be the SMC reset switch, and just put everything back in and powered up. When I powered up, the screen was in Yellow scale!!!!!! What the hell did I do??? Is that button the "Destruction Button"???