I have Snow Leopard installed on an 8GB Flash Drive. It works all good and fine. The only thing is I don't want to do an upgrade, I want to do a FRESH erase and install of my machine (macbook). I tried plugging in the USB drive and restarting the computer while holding down "c", this proved to not work. Any way that I can erase the computer completely and fresh install from my USB drive? Thanks so much!