wiping a mac hard drive.

self explanatory, i need soem help wiping my sisters mac HD. she fucked it up, and i wanna do a completely clean instalation.

i checked the conenction and everything, and i dont know how to boot to knoppix, im still learning how to install OS's on macs and boot commands and such.i appreciate all the help =3 usually people get all haetfull with macs.