Occasionally when I try to log in, there's a long delay before I can type in the password. By long delay, I mean 3-5 minutes. During this delay, the login screen is completely unresponsive. I can't click on anything on the screen. The keyboard appears to be responsive - caps lock/num lock lights go on and off. After about 3-5 minutes it suddenly starts working and I can type in my password at which point everything appears to work normally. I haven't found any pattern to when this happens or doesn't happen.