Hello everyone, I recently got an ATI Radeo 3870 video card for my mac pro, but like many was not happy with the noise it makes. Reading forums, I decided to replace the cooler with an aftermarket one. I got Arctic Cooling Accelero S1 Rev 2 cooler. When I installed it, the computer starts booting up, I see the Apple logo and the "spinning wheel". But when (I suspect), the OS starts to load the graphics and wallpaper, the screen goes black and the monitor enters powersafe mode. I installed the original GPU cooler and the card works, but it is too loud. Any ideas why the card with after-market passive cooler would not be able to display video? Thank you, AK.