My imac computer is not working at all. On black screen
My imac is not working when its on no sound no picture nothing at all
iMac 21.5″, macOS 11.2
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How do you know that it's on?
Check both ends of the power cord to make sure that they are snug.
Then follow each of the steps at > https://support.apple.com/en-us/HT204267