White pixel/dot top left corner of screen?

So I just got my new Dell studio xps 16" laptop on Saturday. I reinstalled using my own Windows 7 Ultimate 64bit disk and have had absolutely no problems.


However today, I noticed that there is a single bright white pixel in the top left corner of my screen exactly at the (0,0) position.

It seems to only show up on the desktop, because running pictures over the corner where it shows, it does not show up. I also have run several programs to check for dead pixels, and it does not show up.


I know it is not a dead pixel because it shows up in a screenshot which I have included.

My video card is the Radeon 4670 1GB.


I have found a few threads online where people have the same problems but none of them really gave any soloutions.


I have found that if I terminate the wdm.exe (Windows Desktop Manager) process it disappears. However, that stops my window peeking from working.



Another thing, it does not appear right after I log in, maybe about 10 seconds after windows has loaded.

Any ideas?

It's not just ATI cards, my HP laptop with the Intel integrated graphics does the same thing.

Could you post the wallpaper?

Do you have aero turned off?

There is a known Windows bug that causes this. I think it was when you had aero turned off or maybe transparency turned off. I forget exactly, but it was some slightly not ususal configuration of the desktop preferences. It is a Windows 7 bug though.

Not sure if it's been fixed yet in an available patch, hopefully by SP1 at least.

[Edit] Oh that link above seems to confirm thatit's when you have transparency turned off...[/edit]

I have the same issue when Aero is enabled. Changing transparency setting does not help. What shouls I do? Win7 is SO buggy!!!! Especially the Aero with which Clear Type does not work in the taskbar and menu and the maximize window effect is missing.