Cannot get past the opening password screen on a macbook air.
I was delivered a Macbook air today and found that upon booting it up for the first time there was another account already on the computer that had not been removed. I cannot get past the password screen, because I do not know the previous owner's password, obviously. I recently ordered the computer through my university's online bookstore and had it delivered to my home. The item was not labeled as refurbished when I purchased it, so naturally, I assumed it was going to be new. Is there a way to get around this password issue? If not, what do I do?