I have 2 black squares that have appeared in the top corners : 235

I have 2 black squares that have appeared in the top corners of the screen... how do I get rid of this?
Submitted on 24-3-2017 at 21:38 in forum Viewsonic Pro10 Series Report abuse

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I have 2 black squares that have appeared in the top corners of the screen... how do I get rid of this?

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