Impossible to reset the password system on MBP

I have a Macbook Pro bought in September, which had to go to the repair and the hard drive has been wiped. Now I have it back it does not recognize my password.  I managed to set up another account, but now it will not accept the password for it.  When I started it up in recovery mode, I was not given the option of disk utility, but it has a black screen and check wifi.  The spinning wheel takes approximately 20 hours now.  Please can someone help, I'm desperate.  This is where the good old fashioned CD would have been useful. I'm on Yosemite.

Thanks in advance.

Ator-password http://www.MacObserver.com/TMO/article/OS-x-Yosemite-How-to-Reset-Your-administr

Tags: Notebooks

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