Annoying sporadic flicker: please help!

My screen flickers every 15 min or so. I tried different display ports, and I checked for viruses. I only have one option as far as refresh rate goes and thats 60 hertz. Its an apple 30" cinema display. I never had an issue with it before hooking it up to my new PC. Its driving me insane. Im running windows 7. What is causing this and how do I fix it? My tower is brand new with all the latest drivers as far as I know. There seems to be no pattern. Sometimes it happens every 15 min and sometimes it will go longer. Can a program I'm running be causing this?
heres a video of it:


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