iMac restarts after the osx update

Hi my son has an iMac (mid-2011 Office), and there is an OSX update it will update, but then goes to a screen gray white and just sat there. I've left overnight and does not finish the installation and come back to life.

I tried to reinstall the operating system via CMD R and I tried first aid on the hard drive.

If I reinstall the iMac from the time machine backup recovers OK, but I can't get the updates of the OS on the machine.

So my question is that someone has an idea what could be the cause?

I contemplate wiping the HD and basically start again, but I have to reinstall MS Office and his Steam account

Any advice would be welcome

Your Modem may be loss of connection? Are you using Wifi?

Tags: Mac

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