Read Also: How to Enter or Change Windows 8.1 Product Key So, as we can see, this is a pretty experienced user and he has tried some potential fixes to remedy his problem. If you have found yourself in the same situation, you can go ahead and uninstall the KB files which came with the latest Windows 8.1 Update, and then try to perform another install in Clean Boot mode. Also, go ahead and open the Device Manager and from there, try to uninstall video drivers and the download them from the website of your maker. Also, if you are having the issue on a separate monitor, try to uninstall and install drivers separately for it.

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