Monitor keeps turning on and of when on hdmi cable

[Crispy Chris]

Hi,

I have this problem, I would like to get help with

When i plug my pc to led monitor using hdmi cable, and start to watch netflix or dvd disc movies,
monitor keeps turning on and off randomly. The movie is going right as i hear the sound.
But display keeps turning once, pause a few seconds, then turns off and on in a row, then it stops and goes again.

But, when i play a game, it goes well without a hitch, not a single turn in black.

When I switch cable, it's the same thing. I tried changing res or refresh rate - same.
Tried switching hdmi cables - same. Games works well, movies randomly turns monitor on and off.

And when I use my old DVI-I cable it works like a charm both ways.

Can Somebody tell me what is going on? Is my HDMI port failing? But what about games running like there's no problem.

My PC SETUP:

Mon - Samsung S27D390 1920x1080 60Hz
ASRock 770 Extreme 3
AMD Phenom II x4 955 BE
Palit GeForce 650 Ti Boost 2GB
8GB RAM 667MHz

Thanks in Advance, Chris.

 

[Gaagles]

Seems like the cable isn't connected well enough, my second monitor does this rarely.

 

[Crispy Chris]

Well, I'm sure it can't go deeper into port. It's firmly attached, besides in games it would probably go crazy same as in movies if it would not sticked properly.
Anymore ideas?