Premier pro play back screen goes black a freezes every 15 minute . This is my second mac pro with identical problems.

Premier pro play back screen goes black a freezes every 15 minute . This is my second mac pro with identical problems.

SOLVED!!!!!
SO I did some more digging around and read ATI cards seem to overheat easily.  I knew the fan was working, but after closer inspection I realised there was ALOT of built up dust on the card and clogging the fan and airflow.  Blew it out with alot of compressed air, stuck it back in the Mac and BAM...no black screens.  I tested it by streaming 6 video sources...doing 2 screen captures at once as well as watching a HD movie in fullscreen.  Did all this for 30 minutes and no crashes.  I also downloaded an app to monitor the temps inside the computer and the expansion bay stays at 41 degrees.  No clue what it was before but obviously it was hotter than that.  So my problem is solved!  Funny that 10.7.5 made the card work harder.  I wonder if its off loading some CPU stuff to the GPU for processing more than 10.7.4 so its just working a bit harder and so it heats up faster....

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