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Level 1

4 points

iMac starts and powers off before getting all the way on

iMac starts and then powers off about 3/4 the way thru power on?

iMac Line (2012 and Later)

Posted on May 28, 2021 5:06 PM

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Level 10

83,230 points

Posted on May 28, 2021 5:51 PM

Unfortunately that is generally caused by a hardware issue.

Try Safe Mode, as per > https://support.apple.com/en-us/HT201262

And macOS Recovery, as per > https://support.apple.com/en-us/HT204267

Then the Apple Diagnostics, as per > https://support.apple.com/en-us/HT202731

Sadly if none of those get it going or help, see > https://support.apple.com/en-us/HT204267

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Top-ranking reply

Level 10

83,230 points

May 28, 2021 5:51 PM in response to Risk_14

Unfortunately that is generally caused by a hardware issue.

Try Safe Mode, as per > https://support.apple.com/en-us/HT201262

And macOS Recovery, as per > https://support.apple.com/en-us/HT204267

Then the Apple Diagnostics, as per > https://support.apple.com/en-us/HT202731

Sadly if none of those get it going or help, see > https://support.apple.com/en-us/HT204267

Reply

iMac starts and powers off before getting all the way on

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