After a series of very short power outages in my town our Imac boots with the pinwheel going and a progress bar, then the users screen comes up but our passwords no longer opens up desktops, just returns to the users choice screen.  What should I do?

I'm on the choose a user screen and when I enter the password the screen goes white then returns to choosing a user. The system is rebooting differently when I tried turning off then back on, the pinwheel screen has a progress bar and it takes minutes instead of seconds.
what should I try?

You can try an SMC reset, especially if there was a power outage.
http://support.apple.com/kb/HT3964
If the issue seems like it just doesn't want to accept the password you'll need to boot to the install disc/recovery partition of the hardrive by holding the 'option' key while booting up. There should be a utility in there to reset your password.

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