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10.8.4 update killed video; what do I need to replace to fix?

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Motherboard: GA-Z77-DS3H

Video; Sapphire ATI 5450

Sound & Network still working


I'm using a 5450 ATI card and everything was peachy keen until I updated to 10.8.4 and I'm stuck at low resolution. It says in system report that No Kext Loaded for video card.


What kext do I need to get from backup to fix this problem?


thanks so much!




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