Hey all, I have a copy of leopard (.iso) and also one in .dmg format on my macbook. My little bro then scratched it all up thus rendering it unusable. Because I make a copy of them in case this happens how do I install it? I tried the .iso and converted it to .dmg and both did not work. I don't have a dual layer DVD burner, nor do I have the funds for an external harddrive right now.. any ideas welcome..