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I have tested this unit with Windows 10 and DisplayPort, I don’t see anything weird. The system works fine.
It looks that there is some compatibility problem with this TV and Windows 10, the unit works fine because you don’t have any problems with Windows 8.1, the issue is Windows 10.
Have you tried contacting your monitor manufacturer to find out if there are any issues with this monitor and Windows 10?
I have seen on a website where the operation is not guaranteed on systems on which the OS has been upgraded to Windows 10.
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