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May 15, 2016 7:04 AM in response to ruby3918by Jason L,Hi ruby3918,
Welcome to Apple Support Communities.
It sounds like you're unable to reinstall OS X El Capitan on your MacBook Air because the notebook displays a lock icon with a password field which you aren't able to get past. The article below provides a lot of great information about firmware passwords and it should help you resolve the password issue on your MacBook Air.
Use a firmware password on your Mac - Apple Support
Cheers.
