For a moment I wondered if I could have moved the cursor into a hot corner that just shut down the display. No noise or anything when it shut down, just the main display, and an external display connected to it, suddenly went black. I have a Late 2013 iMac 27, which has been trouble-free since I bought it at the very end of 2014, until two weeks ago, when it spontaneously shut off while I was using it, and then could not be restarted. One line summary: imac spontaneously shut off while in use, won't power back up at all, doesn't seem to be the power supply, so what is it likely to be?
Hoping somebody here can help with ideas on what might be wrong.
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