Horizontal lines scaning my display monitor, please help

Hi. I have horizontal lines that scan my monitor whenever i play a game. I can see the horizontal lines only on darker colors like grey, dark-green etc. I have a Samsung E2220 display that runs at 1080p on 60hz on a vga cable (no hdmi/dvi support on it). I tried another vga cable, i tried another power cable but with the same result.
I have all drivers updated (monitor and other hardware). My current PC specs are: AsRock N68-C S UCC, Phenom II x4, 4Gb DDR3, Radeon HD7770, 500gb HDD Sata3 and a power supply Sirtec 500W 80+.
If I open Far Cry 3, for example, i get those horizontal lines. If i minimize the game i still get the horizontal lines if i have something dark on my display (a grey/dark-green/dark-blue website).

Before the HD7770 i had a GTS 450 and had the same problems. Could it be the PSU, or the motherboard or what? I also tried a different display monitor (on the VGA) and had the same horizontal lines scaning my display monitor.
The monitor is a year old, still under guarantee same goes for the PSU and the other components.

What do you think ?

PS: Lowering the resolution or encreasing/decreasing the Hz doesen't help.
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