Hey everyone. The other day I replaced my 8800GT with a 5870 in my 2008 Mac Pro. Now I'm running a 5870 and a 2600XT. I have a 30" Apple Cinema Display connected to the DVI port of the 5870. After a while of being on, and particularly during 3D gaming, it starts to look like this: http://gallery.me.com/ryan42#100110/Cinema&bgcolor=black Note the blue flashing pixels, most visible from maybe 12 to 22 seconds in. This was also a problem on my old MacBook Pro, but I assumed that it was because it had that flaky nVidia chipset that liked to do things like this: I'm not sure what to do here. Since I've had this same issue with an NVidia chipset I thought there may be a problem with the monitor itself. I've read somewhere that a high pixel clock can make a blue line problem more apparent on a 30" Cinema Display, but I think they were an issue that I don't have. This is a video I found which looks like what I had on my MacBook Pro. They have the same model as I had. I have not experienced the problem this severe on my Mac Pro: http://www.youtube.com/watch?v=KUvO-1l92tE I've experienced this on OS X and Windows 7. If I connect another display through the DVI port that's not my 30", it doesn't exhibit the problem, but the only way I am able to do that is through a DVI > VGA converter. I don't have the problem connecting the 30" to the 2600XT. Any advice is appreciated. Also, I have a 15" VGA monitor connected to the MDP port of the 5870 and after a reboot I almost always have to do "Detect displays" to get an image.