I cannot log in on my iMac.  Tried to unplug

I get the start up sound and the apple icon appears with my user icons, the cursor moves but doesn't get aresponse from my icon and I can't login with my password. I have tried the basic unplug reboot; turned off then held the command, option, P, R buttons & also the command, options, O, F buttons; held down the shift button & ran the diagnostic (no problems).  ANYTHING else I can try?  Or do I need to take it to my friends at the Genius Bar to have an internal battery replaced?  Thanks friends

Try starting your computer with command + R, then run disk utility on your hard drive to verify/repair the drive. 
Take a look at this link, http://support.apple.com/kb/HT1782?viewlocale=en_US&locale=en_US

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