I bought a used MacBook Pro and didn't come with an install disc.

I recently purchased a used MacBook Pro, it is the 2006 15.4inch, with 1.83GHz Intel core duo processor. It didn't come with RAM, a charger or the instal disc and the battery was dead. I installed RAM, bought a battery and charger and it booted up no problem, but I can't get past the login because I don't know the previous owners password. How do I get passed this point so? What OSX do I buy?

In the mean time try this: Run Mac Setup Assistant -
Restart the machine with the Command and S keys held down, and type the following commands into the prompt in order:
mount -uw /
mv /var/db/netinfo/local.nidb /var/db/netinfo/local.nidb.old
mv /var/db/.AppleSetupDone /var/db/.AppleSetupDone.old
usr/libexec/create_nidb
shutdown -h now
The Setup Assistant will reappear the next time your computer is turned on. Be sure to enter the commands properly. You will be able to setup your user name password, etc. You can then delete the previous owners User.

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