Password won't work on Mac laptop - Apple Computers & Internet

Hi There,
Since you don't say which password doesn't work, I'm going to assume you mean the password needed to logon to the computer itself...
If you have the OS (operating system) install disks that came with the laptop, or a Mac OS install disk, you can start up from the disk by inserting it into the optical drive when the Mac is on; then restart and hold down the "C" key immediately after hearing the chime-sound.
-You'll need to hold the "C" key down until you see a grey screen with the Apple logo in it and a spinning 'pinwheel' below the apple.
Once your Mac starts from the OS installer disk, you'll see the screen for doing a new installation of the operating system.
Click on the arrow at the bottom right corner of the window that comes up.
Then, look at the menu bar at top of the screen and click on the "Utilities" Menu, and choose "Reset Password".
This will open a new window that is pretty self-explanatory as to setting a new password for the various Users that have been created on your Mac.
Hope this helps & good luck!