One can only assume that you were not the first person to actually use this Mac. Did you have some RAM installed somewhere?
The Password is, probably, just a blank password. Try it and see. If it is, this is not good.
Using the blank password, create a new, ADMIN, account for yourself using your name and then you WILL be prompted to enter a password.
Once you have established yourself as an Admin on that machine, you can delete the other, Apple Owner, account by going to System Preferences > Accounts and single clicking on the Apple Owner account and then hitting the "-" button.
Take back your machine.
I just purchased my first ever Mac yesterday. I've wanted one for years.
I'm trying to install some programs and when I attempt to, Installer prompts me for a Username and Password.
I was never asked while setting up my computer whether or not I wanted to assign my computer with a Username or password.
The Username field is already filled in with "Apple Owner" and the Password field is blank.
Does anyone know if there is a default Username and Password and if so, what it is?
I'm very troubled by this and any help is VERY much appreciated.