Earlier this week, Apple released an update EFI computer Mac Mini this year. Mac mini EFI Firmware Update 1.7 is recommended for all owners of the desktop, and solves the problem with flickering external monitor connected via HDMI.
After rebooting the Mac mini gray screen will appear with a status bar that accompanies the installation. Do not worry about your computer at this time. At the end of all the action, which normally takes a couple of minutes, EFI your MINIKIT updated to version 0106.03.
The update can be downloaded from the support site Apple (DMG, 4.53 MB) or with Mac App Store and a built-in mechanism of the system Software Update.