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Hi everyone, So for months I had my Mountain Lion/Windows dual boot build working great, but yesterday I changed my video card from nvidia to amd and now before I even get to the boot screen to choose my OS I receive this error. I can still log into my windows system fine by changing my boot sequence to my Windows HD to boot first. Any insight on this problem would be appreciated. http://imgur.com/Eyw8Utr Specs: Mobo: Gigabyte GA-Z68X-UD3H-B3 CPU: i5-2500k GPU: AMD R9 280X