Currently Being ModeratedMay 11, 2012 3:36 PM (in response to Jeff7676)
The following support article is somewhat outdated. Where it refers to booting from an installation disc, you should boot from your recovery partition (if running 10.7 or later) by holding down the key combination command-R at the chime. If your startup volume is encrypted with FileVault, you’ll have to unlock it in Disk Utility before you can do anything with it.
Currently Being ModeratedMay 11, 2012 4:44 PM (in response to Jeff7676)
Press the power button hard until it turns off, then hold down the Shift key and tap the power button so it boots, this is Safe Mode.
folllow the Steps here
#7 is likely your issue, but do 4-6 to check for any other issues.