If you have Windows 7 RTM installed in your PC and you suddenly found out a ‘dead’ pixel on the top left corner of your desktop (best visible with dark wallpaper), don’t worry, it shouldn’t have something to do with your display; yes, it’s the Windows.
Microsoft had, few days ago, released a knowledge base article (ID 2020674) which describes the possible occurrence of this white pixel on the top left corner. It seems to be affecting all Windows 7 RTM, including the Windows 7 Home Basic Edition.
One white dot (1 pixel in size), may appear on the top-left corner of the screen in the following scenarios:
- In Windows 7 Home Basic Edition, the issue may occur after a user selects the "Windows 7 Basic” color theme and changes the wallpaper.
- In Windows 7 Ultimate and other editions listed in the "Applies to" section, this issue may occur after a user selects an Aero theme and then un-checks “Enable transparency”.