With apologies, the previous poster is definitely incorrect. Mac OS install discs work with any supported computer, and I've reset passwords on systems numerous times with earlier (and a few times, with newer) system software.

The *actual* reason is very simple: Leopard (Mac OS X 10.5) cannot boot a G3! Its minimum requirement is a 867 mHz G4 or higher. All you need to do is get a 10.4 install disc - from *any* Mac - and boot from that.

Also, does the G3 even have a DVD drive? If not, of course 10.5 or 10.4 (supplied on DVD) will not work, as they cannot even be read by the drive. It is very rare, but it's possible to find an early version of 10.4 on CD though.

Last, Apple is very unlikely to have restore discs for anything that old. As an ASP (Apple sales rep) at a major nationwide retailer, I've had trouble obtaining restore discs for anything over two years old, and a G3... well, you do the math.

I hope this correct information helps.