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If you're talking about that huge ass big blue box in the corner of your screen that is WAAAYYYY more than one pixel stuck. Thats a whole group or sector or what ever they call it. Its not "dead" though, if it were, it would be black. When they're a color, its concidered "stuck", but either way, take that back. And yes, it should be covered.
 
It wasnt a dead pixel seem like something that was running in the background right by the apple logo... I was able to click on it to remove it
 
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