I upgraded from Tiger to Leopard on Friday. No problems upgrading. Today, I downloaded the login update and the computer prompted me to restart. I clicked restart and it hung there for at least 15 minutes. It appeared to be trying to shut down Mail and Azureus. I hard booted my iMac and it brought me to the Setup Assistant. Just to see what would happen, I went through the Setup Assistant, when I finished, the computer rebooted and brought me back to Setup Assistant. I'm not on hold with the lowest tier Apple technical support. The agent is trying to get a high tier on the line. Any ideas?