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My 7790 gives me a grey flickering screen and nothing else when I boot it in Yosemite. I probably need to edit the framebuffer but the information I found regarding editing the framebuffer is seeming to lose me halfway through. I don't mind doing it myself but for the life of me I can't get HDMI or DVI to work. I've been attempting for awhile now getting it to work, and have read plenty of things but somehow I can't seem to get my head around framebuffer editing and it makes me feel dumb as hell.