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Whenever i try to watch a movie with iTunes, i get a black screen with this message in the console:
iTunes[381]: GVA error: AGPMGetManagedPortForAccelerator returned 0x4 for VP4
The build is a g3258 with a ivy bridge fake cpuid, C02LGE6UF8JC serial number, asus maximus vii impact motherboard, and running os x el capitan beta

when i am playing non hd content i am at least prompted with the main menu, but when i press play i go to the result that i get with hd content, a black screen.
I never tried watching movies on this computer before so this could have been a problem in Yosemite too.

PLEASE HELP!

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