Black screen with green dots?

This has happened 3 times now.  I woke up my iMac and the screen was black with green dots.  I could not do anything.  I had to force turn it off via the power button and then turn it back on.  Then it worked fine.  What could be wrong? TIA

Extensive discussion of iMac graphics issues here:
Red and green square dots?

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    Hello fellow techs,
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