My iMac won't go past the loading screen

I turned on my Mac this morning and was greeted my a loading screen (not normal) it loads about one third of the bar then turns it's self off! Any help muchly appreciated.  

....it loads about one third of the bar then turns it's self off! Any help muchly appreciated. 
Is this a grey bar? If so, it sounds like it's trying boot into Safe Mode.
You could try an SMC and PRAM reset:
https://discussions.apple.com/docs/DOC-3603
If it is trying to Safe Boot, this link may help:
http://support.apple.com/kb/TS3148?viewlocale=en_US&locale=en_US

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