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2nd Monitor Not Working on Mountain Lion Radeon HD 7xxx
System: Mountain Lion (newest) i7 3770k HD Radeon 7870 (working with GE=Off) Only thing special changed in boot plist is the ATI ports = 5. I have no ATI config set or anything. Profile is Mac Pro 3,1. Problem: Can only have 1 monitor plugged in (HDMI or DVI - doesn't matter). When I plug...