To reset your OS X password without an OS X CD you need to enter terminal and create a new admin account:
2. Hold apple + s down after you hear the chime.
3. When you get text prompt enter in these terminal commands to create a brand new admin account (hitting return after each line):
- mount -uw /
- rm /var/db/.AppleSetupDone
- shutdown -h now
4. After rebooting you should have a brand new admin account. When you login as the new admin you can simply delete the old one and you’re good to go again!