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Helpful answers
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Jun 15, 2015 8:51 AM in response to waynogby Drew Reece,No the OS is not supposed to 'hang' on restart. You should try to resolve whatever app is causing the computer to fail to restart as designed. It may be failing hardware or third party software. Remove all non Apple peripherals & try restarting.
Do you have any idea what app may be causing it? Can you quit apps & restart to see if the problem ceases?
How long do you normally allow the shutdown process before holding down the power button to forcibly power off?
If this is beyond what you are able or willing to test consider taking it to an Apple Store for a diagnosis - it does not sound good - forcing shutdown can cause data loss over time.
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Jun 15, 2015 8:57 AM in response to Drew Reeceby waynog,I know it's not. But i'm running Vuze probably 90% of the time and it doesn't shut down very well. I occasionally have to restart as Yosemite seems to lose some of my HD periodically ( for example after getting "low storage" messages I checked and Yosemite showed only 3.25gb available out of 1Tb. After restarting it showed the correct 297gb available ! )
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Jun 15, 2015 9:41 AM in response to waynogby Drew Reece,Check all your apps are up to date & check the OS has no outstanding updates in the App store.
You can post an Etrecheck report if you think you want help with looking at what is installed & running. Some third party apps can cause conflicts.
The disk usage sounds like something is writing excessive amounts of data to temporary folders or possibly leaking tons of memory. It is possible the iMac is faulty, but you would expect general instability & you should try eliminating third party software first.
I'd suggest a few basic resets to try to make sure that any damage from previous restarts is fixed…
How to Reset NVRAM on your Mac - Apple Support
Resetting the System Management Controller (SMC) on your Mac - Apple Support
Disk Utility 12.x: Repair disk permissions
Mac OS X: Disk Utility's Repair Disk Permissions messages that you can safely ignore - Apple Support
I would also reboot to Recovery mode (hold cmd+r at boot) select Disk Utility, use the first aid tab to verify & repair the disk(s). That should ensure the filesystem is in good working order.
Make a note of any error messages.