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There's nothing wrong with your Mac - the AMD video driver for the Retina display only works in Windows 10. It will probably crash if you do other stuff like try to run a game.

Mach 4 works on Windows 10. Can't you just upgrade to that?
 
There's nothing wrong with your Mac - the AMD video driver for the Retina display only works in Windows 10. It will probably crash if you do other stuff like try to run a game.

Mach 4 works on Windows 10. Can't you just upgrade to that?

Ahh this is news to me, can things also be ran with the USB port with Mach 4?
 
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