http://www.macnn.com/articles/12/12/10/targets.2012.minis/
Mac mini EFI Firmware Update 1.7 fixes HDMI flickering
updated 04:23 pm EST, Mon December 10, 2012
Targets 2012 Minis
Apple has posted a small update for the Mac mini, EFI Firmware Update 1.7. The code is just a 4.53MB download, but fixes a problem with Minis which caused flickering when hooked up to a monitor through HDMI. Only owners of 2012 Minis need to download the patch. The support document for the update warns that users should leave a Mini completely untouched during the upgrade process.
