diglloyd Mac Performance Guide
In Motion There is Great Potential
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Hot Corners to Work Around Black-screen Video Problem on Mac Pro

Please refer to Sept 9 notes on the Mac Pro video problem.

Here is a workaround (absurd to be sure) that works for me. Set up a “hot corner” that puts displays to sleep. When a screen stays black, mouse into the hot corner; this blanks the display(s), then mouse out and this causes some kind of reset to occur. So far, this has worked 100% of the time for me.

Hot Corner control is in System Preferences => Desktop & Screen Saver.

hot corners to blank/unblank screen on Mac Pro
Set up a hot corner to toggle screen off and on
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Cycling

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