I restarted my macbook pro and it cannot start again! what can i DO??

I restarted my macbook and when the  apple logo appeared back it started loading endlessly and it doesnt open !! what should I do ? the only thing it allows me to do is to shut it down. I did so and still when I reopen after the logo appears it is loading endlessly and cannot open or even let me log in! please any info might be usefull!

Try a SMC reset:
http://support.apple.com/kb/ht3964
Try a Safe Boot:
http://support.apple.com/kb/HT1564?viewlocale=en_US
Ciao.

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