HELP!! Think I've ruined my X1900. I just fitted a Thermaltake AT1 cooler to my X1900 in my MacPro. Followed some instructions off the net to route the power cable to the spare 2nd DVD drive bay - pretty easy all went fine. Turned everything back on (with side removed) 2 little red lights flashed on and off on the X1900 (+ loads on the ram cards etc) AT1 fan running beautifully - very quiet BUT No blank screen. 2 things I did - 1 - I rubbed a smudge of old thermal paste off the graphics chip with my finger before I fitted the AT1 2 - probable cause of problem - The bloody screwdriver I used to fit the 4 screws to hold the AT1 to the X1900 was one of those with a magnetic tip AHHHHHH . . . . Is all hope lost!! A new Mac X1900 in Australia - from the Apple store is over AU$600!!