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Made an error on changing password now it won’t let me login into my computer on boot up
MacBook, OS X 10.11
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You'd have to start up from the Recovery Partition, raj1soni.....
on startup, hold down the Apple (command/cloverleaf) key +R together until you see the language selection screen, pick one and continue. Move your mouse/trackpad to the top center of your screen and click until you see OS X Tools. Choose Terminal. in Terminal, type in "resetpassword" without the quotes and press the enter/return key on your keyboard. This should get you into the main password reset app. From there you can reset and "fix" your password.
John B