Nothing Loads After Battery Replacement

I had a Genius install a new battery in my MacBook Pro (2010) which is using original snow leopard software (not sure which version update). Was not having any problems with it other than that. This is the first time I have tried to use it since receiving it back (at the store I rebooted it and was able to successfully log into the computer but did not attempt to load anything). Now, I am plugged in, started up the macbook, and absolutely nothing will load. Battery is at 82% and climbing. I had to hard force a restart to get my docs to show in my Documents folder. I was going to go into System Preferences to see if i could shut down some startup programs, but even clicking on system prefs has resulted in the spinning color wheel. Any ideas other than the obvious "take it back to the Geniuses who messed it up initially"?