Flickering lines?

Whenever I try to play games on my computer, I will get transparent, gray, horizontal lines/bars moving down my screen. This happens especially on graphically stressful games.

Here are my components:
Motherboard: ASRock z77 extreme4
Processor: Intel Core i5-3570k
OS: Windows 7 64-bit
GPU: Galaxy GeForce GTX 670
RAM: Dual 4GB DDR3 ballistix
PSU: Inland ATX ILG-600 600W
Monitor: AOC 21.5" e2250
Case: Zalman z11 mid-tower case
Hard drive: Seagate Barracuda 1TB

Solutions I've tried:
-Uninstalled drivers and reinstalled
-Replaced the graphics card (AMD RADEON 7870) with the same one, when it still didn't work replaced it with GeForce GTX 670
-Tested each individual stick of RAM
-Tried a different monitor
-Updated the motherboard's CHIPSET (NOT the BIOS)
-Turned on V-sync

This has been an issue since I got the computer (a week ago)

Any ideas on how to fix this problem?
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