Grey progress bar on boot

My Mac Pro restarted several time last night due to power outages during a storm.
Now when I boot it there is a progess bar under the spining wheel on bootup.
Boot process takes longer then usual as well.
How can I fix this?

Almost seems like it is stuck in a loop of starting to Safe Boot. Try resetting the PRAM and SMC.
Resetting SMC: http://support.apple.com/kb/HT3964
Resetting PRAMhttp://support.apple.com/kb/HT1379?viewlocale=en_US:

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