Just running updates this morning and right in the middle, the screen got rainbow, diagonal boxes all across the screen. Then the system beach balled and would not respond. Hard booted and boots to rainbow screen even before OS launch. Tried to get into my BootCamp partition and simply reboots after a minute of trying to boot into XP. When I let it try to boot to OSX, the rainbow screen goes away and I get a grey screen but no boot. In Firewire Target Disk Mode, I get the Firewire logo behind the rainbow screen. I have not yet tried to connect via Target mode as I do not have a firewire device handy. MY MBP is out of warranty as of November! Think it is a dead drive, dead video, or dead motherboard? Is this going to be a killer repair bill?