Strange Mac Behavior

The problem was, after logging in, it'l llock up.  Then I have to hard power down and start up again.  Then I have to restart from the login screen, then I could log in.

The solution that worked for me is here:

http://osxdaily.com/2010/03/24/when-and-how-to-reset-your-mac%E2%80%99s-system-management-controller-smc/