When I log in on my iMac, I get a no entry sign, help?

When I turn on my mac, i can log in.  However after a while the usual apple logo turns into a no entry sign.  It stays like this and I can't access my actual account, I have tried restarting, pulling out the plug and putting it in again, I've tried to reboot while holding 'x', I've reselected my hardrive with the alt button.  None of this seems to work, please help!!!!

When I turn on my mac, i can log in.  However after a while the usual apple logo turns into a no entry sign.  It stays like this and I can't access my actual account, I have tried restarting, pulling out the plug and putting it in again, I've tried to reboot while holding 'x', I've reselected my hardrive with the alt button.  None of this seems to work, please help!!!!

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