i tried installing mojave in my imac 27inch late 2012 but when im in process of installing, it just hangs. I tried doing cmd-opt-r(hang),cmd-r(hang),shift-opt-cmd-r(hang). I tried bootcamp, windows 10 is installed but when i tried to install the drivers, when the gfx card (gtx680mx) is about to installed, it just blackout. Someone help me pls. Thanks.