My friend has an old PowerBook, the black ones with the apple that is upside down when the screen is open. It is in very good condition, but it has been sitting around so long that it no longer boots up or anything. When plugged in it doesn't even do anything. Is this something wrong with the charger or the computer? Is there anything he can do? If he were to sell it, how much is it worth? Thanks a bunch for any help you can offer. I'm just looking to figure out what this machine is about, as I know little about older Macs.