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A white dot may appear on the top-left corner of the screen when an Aero theme is selected and “Enable transparency” is unchecked
Article ID: 2020674 - View products that this article applies to.
One white dot (1 pixel in size), may appear on the top-left corner of the screen in the following scenarios:
Microsoft has confirmed that this is a by design issue in the Microsoft products that are listed in the "Applies to" section.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.