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I have an older M-Audio Firewire audio interface that I use with my Mid 2011 Mac Mini. It's running OS X El Capitan 10.11.6. M-Audio never made drivers for this version of OS X, so I have to disable "System Integrity Protection" for the audio interface to work. I do this by booting to recovery > Terminal: csrutil disable then rebooting normally.

However, I have an issue where I cannot logout, restart or shutdown "cleanly." What I typically do is run the sudo restart now command to reboot, or sudo pkill loginwindow to log out. EDIT: What I mean here is OS X (El Cap) is getting "stuck" (just hanging indefinitely) when I try to either a.)logout b.)restart or c.)shutdown. It just does not work, so I use terminal commands to force it, but I want to stop having to do this.

Could this issue be related to disabling SIP? EDIT: I have disabled SIP, no change. They are not related.

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    It shouldn't be, but it might. Try reenabling SIP. If it fixes the problem, you've found it, if not try looking for other causes. – NoahL Mar 26 '17 at 2:59
  • Disabling SIP did not help my issue. Any ideas on what else to try? – SamAndrew81 Mar 27 '17 at 0:02
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    Ok, so removed my answer for not being an actual answer. My first question: do you always experience the described problems? Or just sometimes? When macOS hangs it is usually because one or more specific processes are at fault. Could you check the output of ps aux in terminal if there might be any processes take a large amount of CPU or MEM usage? – Montmons Mar 28 '17 at 5:02
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    You could also try holding down the command-key when shutting down or logging out.This will skip the pop-up confirmation window you usually would get. So holding down the command-key would help prevent the very rare case in which this window might be what is actually at fault. – Montmons Mar 28 '17 at 5:14
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    Finally, as a first try.. try to search the ps aux output for any M-audio related processes (you could use ps aux | grep -i whatyouarelookingfor to ease your search). Kill these processes and execute a regular reboot. Did that help? It might be macOS gets stuck on trying to close these processes if they aren't actually compatible anymore.. – Montmons Mar 28 '17 at 5:18
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This was a software issue, after all. Once I upgraded to macOS High Sierra I was once again able to reboot normally, regardless of SIP status.

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