OSX Loosing USB connections.

I have been taking a Arduino class for 3 months. right before the final is due the USB serial connection disappears.

Has any one ever seen their dev/(tty or cu).usb disappear? I restarted the program, the computer, I let the thing rest, I tested Arduino 06 and 07. I reinstalled the USB drivers that came in the install package. I can still see serial, bluetooth, dial up, all the things I don't use (which is probably why they are still there)




is the board set to USB power? Could be that the USB chip has been fried, but not likely. try testing by replacing the current Arduino with another one.