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I have an IMAC 21.5 2012 model when boots up stays on for about 30 secs then shuts down get msg saying problem with computer and then it starts to reboot , have completely shut it down and rebooted, same problem tried to start from safe boot same problem - but stays on for about a minute then,
iMac Line (2012 and Later)
Try starting up in Safe Mode, as per > How to use safe mode on your Mac – Apple Support
If that works, restart normally and test.
If that doesn't work, Startup in macOS Recovery, choose Disk Utility, select your Macintosh HD and run First Aid on your Macintosh HD, as per > How to repair a Mac disk with Disk Utility - Apple Support
Try starting up in Safe Mode, as per > How to use safe mode on your Mac – Apple Support
If that works, restart normally and test.
If that doesn't work, Startup in macOS Recovery, choose Disk Utility, select your Macintosh HD and run First Aid on your Macintosh HD, as per > How to repair a Mac disk with Disk Utility - Apple Support
Can you reinstall macOS while in Recovery?
If not, then it is starting to sound more like a hardware issue.
Next try the Apple Diagnostics, as per > How to use Apple Diagnostics on your Mac - Apple Support
If Apple Diagnostics turns up a hardware problem or fails to run? Then you will need to schedule a Service Appointment at your local Apple Authorized Service Provider. Apple - Find Locations
have started in safe mode will stay booted for about a minute and then shuts down, during one time when started in safe mode
i used the disk utility and still did not fix problem. Any other suggestions ? Tks
Thanks will try and let you know appreciate the help
Bill
Imac 21.5 2012 model when starts up boots, stays on for about 30 sec then shuts down, tells me problem and rstarts again and does same thing
