I just bought a brand new top of the line macbook pro and now am trying to get rid of my old one by giving it away to whichever friend wants it, of which there are plenty. It is a 2008 17'' macbook pro. I'm trying to completely wipe the laptop / zero out the hard drive before giving it to someone. I do not have the original install disc any more but I did get a 10.4.8. dmg I could burn onto a dual layer dvd if I go buy one. Its currently running 10.6.8. What is the easiest way for me to wipe it and give it to someone in workable condition? Am I already on the right track with the 10.4 dmg? Thanks!!!