AOC G2790PX Possible Problem

Nov 9, 2018
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Hello guys.I really need your help..I gathered some money and decided to buy an AOC G2790PX PC Monitor..I wanted to see this 144Hz thing.I connected via Display Port ..Tt first I thought it's the monitor having the problem.But I am not sure.I recorded with my phone this footage.I contacted the seller and he told me to record the problem and they will decide if I should send it back (wtf?).Can anybody help me please?

Thanks in advance.

PC Specs:
CPU : i5-4670
RAM :16GB DDR3 RAM 4x(Corsair Vengeance 4GB DDR3-1600MHz (CMZ8GX3M2A1600C9)
GPU : Gigabyte GeForce GTX 1060 3GB G1 Gaming (GV-N1060G1 GAMING-3GD Rev 2.0)
SSD1:64GB
SSD2:480GB
PSU:Corsair CS650M


Youtube video showing the problem :

https://www.youtube.com/watch?v=y2GUA8uX1SU