Re: Selling my Mac - Restore defaults / clean files
Pull out the DVDs that came with it new, and one of them will be a restore/install DVD. Boot from that disk, and tell it to install onto the Macbook. On the page where it asks which drive to install onto, there will be an option button. Select the hard drive, and push that button, and there you should be able to erase and install. That should be what you need.
it's human nature to stand in line...