LG L226WTQ-BF Colour problems

I just bought a new computer and a new monitor.
Using Geforce 8880 GTS graphics card, LG L226WTQ-BF monitor. Windows Vista home premium.
New DVI cable and power cable.

The monitor works fine for 30min or so, drivers everything are installed properly. After that, the colors become messed up. Half the task bar will be grey lines, desktop background image will seem to have satuation 100%. Restarting computer wont help.
Normally when I start up my computer, its a black background with white wordings on the boot screen. But now, its greyish-with lines of light blue with white wordings with cyan shadows. ( something like that, its hard to describe ).

I connected my old CRT monitor and it worked fine. So i thought it was the monitor problem, i brought it back to the shop. Surprisingly, it worked fine there. He told me it might be cable problem, so i bought a new 1 and went home.
At home, i connected it back and I thought it was working normally again. Few hours later, the problem came back, exactly the same situation.

Can anyone out there help me :cry:cry ...

 

Sounds like heat with the timing, Does the video card have a fan? if so be sure it is running, if not might try blowing some fresh air in [with the side cover off] and see if that will tell anything. ed

 

nope, dont think its the graphics card, i even tried unplugging the DVI cable and switch on the monitor.
Normally, its a Black background with a Red LG logo. Now its a Greyish-with light blue patches/lines with Red LG logo...

*I have a transparent casing, i shine my torch at the graphics card fan, yeah its spinning, so is every fan >.<

 

Hate to say it but it sounds as if the monitor is flaky check system with another monitor see if it still occurs.

 

checked with my crt phillips monitor, works fine, but my crt is getting old ( slight curve on the edges ) thats y i wanna change monitor.. :cry

*where do i look for the power supply thingy?*

 

Is this comp still under warranty?
If yes,return it,,this is what I recommend.