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I own a an IMac 2021 seriel # H*********d. While trying to update from MacOS 14.5 to 15.0 the update started normally and ran for 1 or 2 minutes. The computer shut down and will no longer start. I've tried and restarting using the recommended procedures. It doesn't turn on at all.
[Edited by Moderator]
iMac (2017 – 2020)
When doing major updates this puts a lot of strain on the on the computer. Please try the troubleshooting steps provided in the link.
BTW, do you have any of the following third party apps installed on your Mac?
• Antivirus Apps
• Cleaning Apps
• Security Apps
• VPN Apps
• Maintenance Apps
There may be something here:
If your Mac doesn't turn on - Apple Support
Tip: never post your serial number online. Just the model and year are usually sufficient.
While updating iMac from MacOS 14.5 to 15.0 computer shut down and will not restart
