How can I fix E: failed to Mount /efs?

[Donovan Neethling]

E: failed to Mount /efs

Hi

My S3 has stopped moving past the Samsung logo when booting.
I enetered recovery mode and noticed the E: failed to Mount /efs message.
I tried to reset to factory defaults but still encounter E: failed to Mount /efs

After doing some googling, I tried to restore using Kies, then ODIN, but my PC does not see the phone anymore.

I am now trying to install Android from the SD card, but I am not sure how to go about that

Any advise will be appreciated.

Thanks

Don