But I be ****** if I'm going to reinstall Windows 10 again.Īny way to tell under Windows 10 if Thunderbolt is working? I have no other Thunderbolt peripherals to try. In other words, maybe Thunderbolt itself is not recognized because nothing was hooked to it while running Boot Camp Assistant. My conclusion is, one of two things is going on:ġ) The 27 inch iMac w/Retina's AMD graphics card is the issue (as it is the only difference in the scenarios), orĢ) One must have the external monitor hooked up and on while preparing and installing the Windows 10 installation. During that week, I had windows 10 installed on it and the same external monitor worked fine, in both Mac OS X Yosemite and Windows 10. How do I connect my Apple Cinema LCD 20' Display to my 2020 Mac mini M1. The weird thing is, I had a 21.5 inch iMac for a week (I took it back and upgraded to the 27 inch). I attempted to install a new WIndows driver for the AMD graphics card, etc. The external monitor is simply NOT recognized in Windows 10. I added an external monitor (Toshiba TV Monitor which works fine as a secondary monitor with Mac OS X on this iMac 27 w/Retina).