I did an upgrade and now can't get past login screen

I did an update of my Macbook Pro, non-unibody, running 10.8. ? by using the software update page.  It seemed it wasn't minor corrections to the drivers, but the Mavericks jump or what.

Everything seems to work well and he did it again to the login screen.  Now it makes a loop on the login screen.  When I enter my login, it seems, it tries to connect but just returns to the login screen and my avatar.  If I enter an incorrect password, it is as it should be and shakes the password box, but when I enter the correct pass it's all gray, then black, then loops back to the login screen and my avatar.

Help please?

Bruce

It would be useful that you have indicated the EXACT model/year of yoyr MBP.

Reset the SMC and the NVRAM:

https://support.Apple.com/en-us/HT201295

https://support.Apple.com/en-us/HT204063

Try a safe boot:

https://support.Apple.com/en-us/HT201262

Any change?

Ciao.

Tags: Notebooks

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