HDMI Output Failure on 2-Mini's After 10.9.3 Update

I have two separate (Late 2012, OS X 10.8) Mini's that are both (2.6 GHz Intel Core i7, 16 GB 1600 MHz DDR3) that have been hooked-up to identical Flanders Scientific professional HD monitors via HDMI cables from the computer output to HDMI / DVI adapters into the monitor input and they have worked flawlessly in that configuration since purchase in July of last year. THAT IS UNTIL, I made the stupid mistake of installing OS X 10.9.3 ---
I updated both Mini-A and Mini-B within a few minutes of eachother while they remained online and wired to the monitors in that identical configuration. Mini-A was the first to complete the download and install of 10.9.3 and when it rebooted, the display image did not return. Subsequently, a few minutes later, Mini-B completed the download, install and reboot with the identical result of missing display image.
Monitor info:
2 x Flanders Scientific LM-2140W, 1920x1080, 10 bit, switchable multi-input (2 x HD/SDI, YPbPr & RGB Component, 1 x SD/SDI, DVI-I / DVI-A / DVI-D switchable YPbPr / Limited RGB / Full RGB)
Needless to say, I have been fiddle-f***ing around trying to resolve the issue for more than a week to no avail. The HDMI output signal is no longer present on both computers and the only way to feed a signal to a monitor is now via the thunderbolt / mini-display port output using a Mini-Display Portt to DVI-I or DVI-D adapter at the computer to DVI cable into the monitor.
Troubleshooting Procedure included.
PRAM / NVRAM / SMC Reset (no change)
Alternate Cables (no change)
Alternate Monitors (no change)
Alternate Computers running OS X 10.8.5 via HDMI wiring schema as before (image on both monitors)
I'm no GENIUS, but I do have a modecum of experience with troubleshooting this kind of stuff and I am 100% confident that OS X 10.9.3 has caused this problem. Now, who wants to tell me how to fix it before my warranty runs out in 45 days.

Sordidloam wrote:
So to be clear, this issue occurs on any input with the Denon Receiver. Occurs from both HDMI out and MiniDisplay Port out. Goes away when we reinstall the OS and update it to 10.9.2. Comes back as soon as we update to 10.9.3.
Cheers
MLE
Have you been able to use the Mac Mini directly attached to the plasma/LCD/projector with out going through the Denon AVR? Even with 10.9.3 installed?
I have a Pioneer AVR and I have the Mac attached via a HDMI to HDMI and all is working for me. Can your Denon do some upscaling? Some AVR, like my VSX-53 can change the scaling of the input video. Meaning if I still had my Apple TV 2 which outputs 720P only, can be upscaled in my AVR to 1080i or 1080P or even 24fps. Heck, I could even plug in an old style Red, White, Yellow cable and upscale it to 1080P and output it HDMI.
I am wondering if your Denon is able to do that and it might be set wrong. Check the owners manual for such settings. Even the plasma/LCD/project could be doing the upscaling too. So check that too.
KOT

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http://byuu.org/articles/computing/edid
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Problem Resolved. But it was complicated. And a huge pain in the rear.
TL;DR: I flashed the EDID as described here. This is not recommended for the weary. Ideally, Apple should release an update OS X that will include the updated Intel HD Graphics 4000 drivers that utilize the CEA flag properly.
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<http://www.kanexlive.com/xd>
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