I have read that someone replaced his 2012 Mac Mini Memory with 2011 Memory and got suddenly issues.
The specifications for the mem 2011 = DDR3 1333 mhz
The specifications for the mem 2012 = DDR3 1600 mhz
If you use the 2011 Mac Mini memory in the 2012 Mac Mini memory, than the memory will be downclocked to DDR3 1333mhz. Since the intel GPU is using this system memory it can have compatibility issues, en thats why you could have display problems.
Summary:
Since the Intel GPU is using the ram memory, it could have compatibility issues with certain ram modules at 1333mhz or 1600mhz.
It can also be that your 1600mhz is downclocked to 1333mhz and have problems like the person i mentioned above.
The questions i ask you!:
1 What for model/brand/speed memory are you using? And is it "apple" memory or custom?
Maybe the problem only occur with certain ram modules since the Intel GPU is using the system memory.
2 Which CPU are you using? (Dual-core/quadcore, Speed, etc) Maybe it only happens with a
batch/serie CPU's since they have integrated GPU's.
3 Do you suffer from the black/snow screen isues and/or the bad color/bad text/can't see light shades issues? (Or something else)
4 Do these issues happen if you put all the sleep options off in the power settings? (So that you Mac Mini and screen are awake for 24/7 and at full speed) Because i have read that some engineers said is it probably a software issue because the gpu tells the screen to go into sleep mode.
my answers:
1. Stock configuration from apple for both units (which both have the issue)
2. My personal unit is the i5 model, the other is a work unit and is the I7 server config
3. The I7 gets the blackouts every hour or so, no other symptoms, The i5- 3-4 times a day for black outs, a handful of static occurrences
4. The I7 server config by default comes with all the power saving turned off (since it's a server) and it is the worse of the two, My i5 i have played with the settings with no discernible difference.
The only thing that has been successful for me on either unit is to not use HDMI video in anyway shape or form including adapters. I.E a TB to DVI adapter works great. As does a TB to VGA adapter though you get a quality loss when using that
PS: monitors in use, Dell s2440l, Samsung 23 inch Series 5, No name auptonic monitor. No noticeable difference among all 3 for the black out-static issue
PPS: The samsung monitor also has a DVI input and when connected via mini display port-DVI adapter neither machine has had black outs or static. Unfortunately for me, the samsung belongs to my company