New build, annoying problem

[KaaN10]

http://www.youtube.com/watch?v=pBtbSXhNgiU

I built a new pc a few weeks ago and I've got this annoying problem which looks graphics card related? I recorded this 4 second video (random youtube vid) with an iphone because it doesn't capture it when I record the screen with software and it doesn't show up on print screens either.

Basically towards the end you can see a green/red line flashing, this keeps happening to me multiple times during the day in youtube videos, video files and even when going through pictures on the net. I've only played Assassin's Creed so far for about 12 hours and it hasn't happened in game.

I've tried things like reformatting, installing different drivers, reseating the graphics card, using a different hdmi cable and monitor port but it didn't fix it.

The build is as follows:
CPU: i5 4670K @ 4.1ghz
GPU: Asus GTX 670 Factory OC
Mobo: ASRock Z87 Extreme4
RAM: Corsair Vengeance 2x4GB 1600
PSU: Antec Neo Eco 620C Bronze Certified
Cooler: CoolerMaster Hyper 212
Monitor: Asus MX239H 23in AH-IPS

If anyone could help me that would be great, thanks.

 

[ThermalV]

It could be your monitor/cables? Try hooking it up so it just uses integrated graphics or use a different monitor/cable?

 

[KaaN10]

Same thing is happening with integrated graphics.

Where does that leave me?

 

[smeezekitty]

Monitor problem?

 

[ThermalV]

Pinch a cable off someone and see if it makes a difference, if not it's your monitor most likely.