Restore the operating system to iMac

I turned on my iMac about an hour ago. It seems that hardrive was destroyed? Not sure how but my stepson was angry the other day and night have somehow messed with the iMac and somehow erased the hard drive. A week ago I have for the first time made a time machine backup of my computer on an external USB hardrive 10.11.3.

I'm following the guests and looks like it is re-installation of this backup? Is that all I need to know about re-definition of administrator password? I'm almost certain of that not having my administrator password... But he could have done something else? Or it could have happened on its own? Any help is appreciated here!

Your signature says you have 10.6.8.  This iMac is older than October 2011?

Tags: Mac OS & System Software

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