MacBook Pro shuts down after booting PLEASE HELP!

To begin with, I couldn't remember the password to my computer so what I did was

tried to reset the password on recovery mode. I did "command+ R" then clicked on

terminal and typed "resetpassword". I followed the steps and entered a new password.

after that I went on and re-started the computer from there. After that it tries to boot

but it takes 6 minutes and after it boots it immediately shuts down. It won't let me in.

Can anyone please help, I know that the disk was fine before this. The computer

worked fine before i tried to reset the password can anyone please help me out. Thanks

I also tried to repair the disk through the recovery mode because it says it needs repair but I keep getting an error that the disk cannot be repaired. I think i messed up the computer with perhaps the code i put in the terminal. I am sure that something went wrong after i reset the password on recovery mode. PLASE help