Strange Pixel Issue

I am looking at the 4k screen on a p753DM and there is one bright pixel (or 4). It stays white no matter what I change my desktop background image to be. It doesn't remain white when something is placed on top of the thing. Here are some images I took using the magnifier in windows 7. Since the pixel easily shows the black, I am not too worried about it but I am curious.

What would cause this? The pixel I am talking about is the little white square next to the window in the first image.

 

That's part of your desktop wallpaper, try changing it.

 

Weird ... and to be sure; this is a screenshot, right? Not a photo?

It's not hardware then, so ... make sure to upgrade bios, vbios and drivers. Could also try a dual boot (or usb boot) and make sure it's only affecting one OS. Ah, and run a full virus scan with another scanner than the current one, a trial version will do for that. Could also kill some running programs or use safe boot, to make sure it's not actually a legitimate program with a somewhat buggy design.

 

Like I said, it is there no matter what background I choose. My own photos, the built-in photos. Etc.

 

Yes, these are PrtSc and MS-Paint saves.

 

The fact it is blending through the transparency and going with a window over it rules out a hardware error. Maybe odd windows corruption?

 

Try this: http://www.afterdawn.com/software/system_tools/misc_system_tools/deadpix.cfm

 

So I updated windows and it was gone. I don't miss it.

Thanks to everyone who took some time to consider this.

 

DELETE