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When I get a black screen, all I have to do is press f3 or fn+f3 which cranks up the brightness. It will turn the screen back on again!

Hi, first of all I wanna thank RehabMan for the probook installer, it's freakin amazing! I've got OS X 10.9.2 running on my 4540s almost perfectly now. I've bought a AR9285 (not a HP spare part) and it worked immediately. Some minor issues with the USB ports though, only the front right...