4 Replies Latest reply on Jul 14, 2018 12:14 AM by pokester

    2017 iMac Radeon Pro 560 won't boot into Windows 10 with external monitor attached


      I am running bootcamp and windows 10 on an 2017 iMac 21.5 inch with Radeon Pro560 graphics card.  If I boot on the MacOS side, everything is fine.  When I try to boot on the Windows side with the monitor attached, Windows chokes and won't fully boot up.  If the external monitor is not attached, Windows 10 boots fine.  If I hotswap the monitor to the iMac after Windows boots up, it eventually will be recognized and function.  What is causing this problem?  How can I fix it?