Just got my computer back from the "Genius" Bar and they changed my password

So they replaced my hard drive, great, fabulous. Here I am attempting to reinstall all of my programs and I have no access to my computer. I can't for the life of me figure out what they could have possibly changed it to. Unfortunately the store and the support number is closed for the night. Does anyone have any suggestions? lol

I've tried MANY things...my user name..."apple", "admin", "support" and a list of curses that seemed right at the time :0)

Have you tried leaving the password field blank?

sigh...yep, I've even tried that. I just can't imagine what they possibly changed it to!

Boot the machine with your original install media and reset the password.

See the following Apple KB article. Look at the bottom of the page, those are the instructions to follow: Link

Regards.

try 'password'
that was mine when i bought mine from college

Do what chscag suggested. Put in your OSX DVD that came with your machine and follow that URL.