My school gives out MacBook Airs to students to use for the year, and I always like to "tinker" with mine and see what I can and can't get around. Well this year, I made my account a Admin account and played around with things, and accidentally set the boot disk to a network drive at school. Now when I try to boo the machine, it blinks with a globe, that even after hours, never ends. Also, theres a firmware password on it, so I can't hold down the option key to select the boot drive. What can I do? Thanks!