I need to find a Mac G3 800Mhz Power Adapter for a laptop. There are two different kindsof the G3 laptop. The 500Mhz and 800Mhz. I need the 800 one. I have one but the wire in the cable have started to come undone. And I already bought a new battery that wont charge past 70%. And it takes like a month to get that far. Need help.