iMac 2008 boot problem


hi,

have imac 2008 , installed mavericks on it. have installed update through mac store , since when boot imac up.. have grey bar apple logo on boot screen. when grey bar done imac shuts down , when boot again, grey bar starts again.. have tried smc , pram reset. nothing worked.

have solution?
answer
 

have tried starting in safe boot holding shift during boot?
 


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