I had a friend coming over who had planned on using my comp when I wasn't home. So I wanted to make him his own account where he would not have access to my stuff. I changed the HD permissions to Administrator: Read and Write and Standard: No Access. Now it won't boot up! It hangs on the gray apple/spinning black dash circle page for an hour now. What I've tried so far: As I can't boot up there isn't much I can do, but I have tried unplugging everything, waiting 30 seconds and rebooting but this had no effect. Please any suggestions would be greatly appreciated! I'm at work so I cant try anything till I get home but I will respond to everything and let you know the results.