help uploading diecemilia

I just hooked up a new arduino decimilia and it won't upload. I'm running a Mac, OS X 10.3.9. It says "uploading IO booard" and never changes. I'm on a deadline please help!!!

hello did you select the correct port from the serial port menu

it should be something /dev/cu.usbserial-AXXXXX where XXXXX changes depending on your board