hi all, I've started experiencing some really weird behaviour from my 2006 Mac Pro 1.1, running Snow Leopard. The Mac will be fine for a short amount of time, but then suddenly red dots will start to appear and eventually freeze the entire Mac and the screen will be covered in a red fuzziness. I would have put this down to graphics card failure, but the mouse is still responsive and the header bar doesn't suffer from the red fuzz. I'm positive it's not the display as I use this for other sources and they're completely fine. I've attached a picture for reference. Anybody have any suggestions as to what the problem could be? Hoping my trusty workhouse isn't finally biting the bullet .