Hi, I bought a new monitor today, I connected it with a standard HDMI cable that came with it.
I have a dual monitor setup, the second one is connected with a DisplayPort to HDMI cable, as my GTX 960 only has one HDMI, one DisplayPort and 2 DVI's.

This only happens on my new monitor, the one connected with HDMI to HDMI, previously I was using the same installation, the same cable but with my old monitor and this wasn't happening.

Disabling Hardware Acceleration helped but I notice the browser really slow.

My question is, why does it happens only on my main monitor? If the problem was the monitor, then why disabling Hardware Acceleration solves the issue?

I have to say that this doesn't happens every time I open a youtube video, only some times, I tested playing a game and it doesn't blink.

SPECS:

• Intel i5 4670K @3.4GHz
• 16GB DDR3 RAM
• 128GB SSD only for the system and essential programs such as Opera, IntellIJ...
• 1TB 7200rpm HDD
• NVidia GeForce GTX 960 4GB
• 2 1080p monitors at 60Hz

 
Thanks for the help.