![]() Investigating login items, fonts, and kernel extensions (see below).įollow the steps below to run Apple Diagnostics: If the problem is not present during Safe Mode then it's time to investigate login items, fonts, and kernel extensions.If the problem is still present during Safe Mode and afterwards, proceed to 1.Now, depending on the above testing, we can narrow down how to proceed: Exit Safe Mode by restarting your iMac as normal.can you shut down normally or is the issue still present) Let go of the Shift key when you see the login window (NOTE: If you have FileVault enabled you may need to log in twice).Immediately press the Shift key and keep it down. ![]() Below are some additional steps I'd try next, especially since reinstalling macOS only resolved the problem for a week or so.įollow these steps to boot your iMac into Safe Mode: Troubleshooting is a process of elimination and you seem to have started off well, doing most of the obvious first steps. ![]() I'll be taking it into Apple for repair, so I'll keep this answer up to date with the outcome. I've run Diagnostics before, but this time I ran it straight after the Mac restarted from a failed shut down. I'm happy to invest more into the bounty to get an answer that resolves or at least identifies the problem causing it to happen.Īfter going through the steps in the answer provided by Apple Diagnostics uncovered an error NDT001: There may be an issue with the Thunderbolt hardware. I'd really appreciate your help here guys, this has been going on a while and it's becoming a bit of a nuisance.ĮDIT: This question appears to highlight a pretty common occurrence. This has temporarily fixed the issue, but it soon comes back after a week or so. I've also reinstalled the system twice, one time upgrading from El Capitan to Sierra. Even then I have to do it 2 or 3 times before it works. Resetting the PRAM allows me to shut down most of the time. This often leads to another issue which is freezing on reboot (Apple logo and progress bar that doesn't move). I've been in touch with Apple Support about this issue, and the only advice they could give was to run First Aid in the Disk Utility. The Mac responds to being shut down immediately.įirst I should state I've pulled out all USBs etc. It doesn't behave like this Mac OS X never shuts down.
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