Upgrade hanging

I click on upgrade to El Capitan on my imac 27 "and after 12 hours, it is still suspended on the last 10%.

what I see is the apple logo and the loading bar a 90%.

How long will it take?

or it does not work?

Can anyone help please

First of all: you have a backup of your original configuration? (Not that you can do very much at this stage, but it would make life easier.)

Then: press and hold the power button for about 5 seconds until your Mac stops. Back on the power and wait for results. Chances are you need to reboot again, this time in Recovery Mode, check the disk with disk utility and (if the disk is OK) reinstall OS X: OS X: on OS X Recovery - Apple Support

Tags: Mac OS & System Software

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