After update to 10.8.5, My MacBook Pro 15" Retina won't login

Updated my Macbook to 10.8.5 via the App Store.
Update downloaded fine and asked for a restart.
Restarted the Macbook and went to login......then my face dropped.
Once I typed in my password and hint enter, it logs in, screen goes white then returns to the login screen.
I've tried using recovery mode and resetting my password to see if this helps and I ran Disk utility and neither helped.
Any ideas before I wipe it or chuck it through the window?
Any advice greatfully received

Read through the below linked article.
http://support.apple.com/kb/ts2570
For details
Start up in Safe Mode.
http://support.apple.com/kb/PH11212
Reset PRAM. http://support.apple.com/kb/PH4405
Repair Disk
Steps 2 through 8
http://support.apple.com/kb/PH5836
Reinstall OS X
http://support.apple.com/kb/PH10763?viewlocale=en_US

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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http://www.reedcorner.net/mpg/

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After update to 10.8.5, My MacBook Pro 15" Retina won't login

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