My old version mac book airdoes not start up so i tried to reinstall lion but it says its locked. how do i unloke it with out being able to start up the system.

my old version mac book air does not start up so i tried to reinstall lion but it says its locked. how do i unlock it with out being able to start up the system.

Could be. The "lock" isn't actually looking for a password.
WARNING: This will completely erase the ENTIRE hard drive.
What you would need to do is boot to recovery > disk utility > select the MAIN drive on the left side > partition > change partition layout from CURRENT to 1 PARTITION > ensure on the right side it says Format : Mac OSX Extended (Journaled) then push APPLY.
Then if it will allow us, close the windows until you see the 4 options popup again and select "Reinstall Mac OS X" select the Mac HD and you should be good to go!

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