I purchased an Apple Mini Displayport to VGA adapter as a Christmas present for my sister this year. Turns out, the adapter doesn’t work with her 2012 MacBook Pro, it causes the computer to “beach ball” or hang until it’s unplugged. I did some Googling and it seems this is a fairly common problem with the new MacBook Pros, and there is apparently no solution, it just seems to work or it doesn’t. Why doesn’t an Apple adapter work with an Apple notebook? Oh the wonderful world of proprietary hardware.