My FDHD just came in the mail today, has been working great all day. Now i was just on the desktop and i wanted to see what would happen if I hit the programmer's switch, so I did. The machine threw an error, i hit OK to reboot, it froze so i flicked it off an on with the power switch and now it doesn't boot. The disk crunches for a bit, I get a happy mac, then it switches back to a blinking question mark on a disk. How can i fix it?