Screen blacks out

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The screen on my imac goes black sometimes. Sometimes it comes back by itself and sometimes not. If I reboot it operates much better but usually slows down and blacks out. I have had my mac for three yrs and this has just started. What do I need to do to fix it?
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
When that happens again, if possible, hook another monitor to your iMac or even a TV to see if that same black out occurs on the monitor or TV. Let us know the results.
 
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Screen black outs

I don't have another monitor to hook it to. What seems to happen is when I let it just go to sleep, instead of signing off, when I come back to it and wake it up is when the problem occurs.
 

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