Disabled in what way? The passcode? If you forgot the passcode you have to restore the device and you want to sync to the computer that you last synced to in order to retrieve your data. This explains restoring.
If the iPad will not boot up - reset it.
Reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.