"(Correct Answer) Re: Intel HD 4000 Graphics (i7-3770K) occasional flicker
This issue is a BIOS issue specifically with the Memory Reference Code (MRC) version 1.4.0.0 or older. Please contact your system or motherboard manufacturer for a system BIOS update for your system or motherboard that includes MRC 1.5.0.0 or newer.

If you have a system with 2 or more memory modules and are comfortable with removing all but one of them so that your memory is in single channel mode, try and remove all but one of them and the issue will go away. This can be used as a workaround until you are able to update your system BIOS from your system or motherboard manufacturer that includes MRC 1.5.0.0 or newer."

I checked the EFI/Bootrom (and SMC) revs of the 2012 Mini I used (2.3GHz core i7 (mobile), 2x2GB ram) - no flicker/dropout issues seen so far:

• Bootrom (EFI): 61.0106.B00
• SMC: 2.8f0

Replies from mini owners that did have dropout/flicker problems had the same versions.

(FYI: I've updated my comments/tests on 2012 Mac Mini HDMI Video Problems to include later tests with an LG LM7600 HDTV using direct HDMI-HDMI connection.)

  

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