After installing Yosemite, I have had problems, so reboot from the internet has now gave me the error message -2102f

No internt, and No WIFI, so eventually decided to reboot from a backup.
Then when I was asked to select which drive, their was no Mac HD listed.
Speaking with Mac support, they suggested booting from internet, so tried that and got a message -2102f.
This is where I currently am, any help!!!

Usually, if your drive does not appear at all in Disk Utility, then it has died. What is the exact model Mac that you have? If it is pre-2011 then it cannot do full Internet Recovery. I don't know what the error message means. Are you using a default router setup or are you using your own configuration with different DNS settings? I don't know what that error means, specifically, but usually those errors indicate a connection problem. If possible try using Ethernet rather than Wi-Fi.

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