I fixed my screen flicker with HDMI by...

I went to system prefs -> then screen -> change resolution to 1080p and it fixed the problem. Before my monitor was on 1080i.
I have Version 10.7.5

I looked over a number of mac forums and I can say that there are two separate flicker problems:
1. Continuous flicker, obvious on a blue/gray wallpaper when dimming the brightness. Flicker not visible on full brightness, growing while dimming the display. At 50% brightness the display is very usable, flicker visible only if you are actually looking for it. My take this is a software problem (found few people saying the flicker is gone in Windows XP in bootcamp, but present in OSX).
2. Random flicker, ranging from almost visible to flashing screen. Comes at random times, with or without the power adapter plugged in. Can appear in all sorts of combinations/situations. I do not want to assume anything here, but I feel this is a hardware problem based on the YouTube clips I saw.
My case was the first one, thank God and hopefully it will stay like this, although I saw MacBooks on display with no flicker whatsoever.
On the second case, I think a trip to an Apple Service Center would fix it. Unfortunately there is no known faulty module that changed is fixing the problem for everyone with the random/continuous flicker. Everything from logic boards to invertors to displays were changed with mixed results. But it seems the invertor is being changed in most cases and most people are happy with the result.
My 2c.
Have a nice day!
Cristian.

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