Clean install of macOS Sierra not working
Title: THREE OPTIONS TO HELP IN YOUR CONCERN
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*FIRST OPTION****......
If you continue to have concerns, noting the previous Stated Advise above, is of good quality....May one suggest going to Recovery Mode ...**First: Shut down the computer NEXT: restart holding the Key Stroke: (Option-Command-R)  You will see a box to select you preferred Language (click continue)(FYI: Mandatory: must be connected to the inter-Net via wifi>>> visible in upper top of bar) Next select Disk Utility> Erase the HD Continue by quitting Disk Utility NEXT Select  Reinstall OS X  (MUST HAVE APPLE ID AND PASSWORD for the Install) Finally When Exiting RECOVERY MODE you will be asked to select a start up Disk (there should be only one selection) Click and continue.  Your Computer will shut down then start up in El Capitain.  Finally, Please install updates  go to Apple.com and install Sierra..... .
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SECOND OPTION....... 
OTHER Possible AVENUES TO RESOLVE CONCERNS:  You may also go the Apple Support: https://support.apple.com and talk via phone call or Online Chat for clear concise steps with clarifications as needed......
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THIRD OPTION......
If you feel the above may be TO DIFFICULT OR UNCLEAR, consider going to the Nearest Apple Store, make an appointment for the Genius Bar to help with this concern....
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Good Luck...
Authored statements: ysureican Fogarty