Impossible to install MacOS Sierra

Hey, I tried to clean install macOS Sierra. I downloaded the file from the app store, created a bootable USB key. Then I erased my drive hard and then tried to start. However I'm unable to install it. Sometimes with a sign even before X that I get to the installation option.

Then I tried to restore from the internet, and which also failed.

I have a Macbook Pro mid-2012 which came with the mountain lion.

Please suggest what to do.

When you try Internet recovery, what part "fails".

You have a backup?

Tags: Mac OS & System Software

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