Mac pro monitor has a shadow in its center. Does anybody know what can cause that?

Last day my mac pro showed a shadow in its display center. Does anybody know what can cause?
I use to use it a litle, cause i'm new on macs and still use pc based on windows.

  Who made the monitor?  Is it even Apple?
  If you have the right connections, try swapping out the monitor with your PeeCee monitor and see if the problems stays or goes.   But does sound like a monitor issue.  But then, hard to know what you mean by shadow...

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