HELP! HD locked on reinstall!

SOLVED: Can't reinstall MacOs because disk is locked (2nd hand MacBook) - MacBook Pro 13 Retina Display Early 2013 - iFixit

HELP! HD locked on reinstall!

HELP can't reinstall mac, or do anything

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HELP! HD locked on reinstall!, Page 4

HELP! HD locked on reinstall!, Page 30

HELP PLEASE! iMac mid-2011 not booting

HELP! HD locked on reinstall!

SOLVED: locked hard drive can't reinstall Lion OSX - MacBook Pro 13 Unibody Late 2011 - iFixit

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How To Fix The Drive Where Windows Installed Is Locked Error?, Video Guide