White squared pixels on screen

[SlowEJ8]

I started up my newly built pc just last night.
And I guess with some heavy usage with installing some programs, I closed my web browsing page with the install up, and i saw a white squared pixeled area.
Is this a cause of the monitor? Graphics card? Or why did this even happen?

For reference I have a 6870.
Also has anyone here used and overrdrive as an overclocker? O yes is it at least decent for a stable over clock?
Or is it worth the trouble getting msi afterburner?

 

[BFG10K]

Are you overclocking anything? Does the problem happen in the BIOS/safe mode?

 

[llee]

What type of cable are you using? Artifacts sometimes show up when I use VGA cables.

 

[Arkadrel]

could be dead pixels from the screen too right? or bad cable.

 

[SlowEJ8]

Nope didn't overclock. I'm using the hdmi cables, apparently the 6870 doesn't come with vga adapters.

It also goes away, does it do that