Hi All I have a late 2015 27 inch imac,upgraded to high sierra and installed windows 10..all seems well at the end of installing win10,in windows i go into device manager and everything is good, except i get 1 or 2 "unknown devices", which i have no idea what they are ( i started from scratch again, and got the same result) ok, seems to run ok wont worry..the 2nd issue is although windows device manager says my graphics card( radeon r9 380m) is listed, i downloaded 3d mark, and after it finished it said it didnt recognise my graphics card?? i went into device manager and clicked on properties and on one of the tabs it says some driver components arnt installed or installed correctly..also i went into bluetooth in device manager too, and it too said the same (altho seems to be functioning fine)..any one else have these anonamoliies with a similar vintage mac and does anyone know how to get my graphics going? any help greatly appreciated