I've been trying to install SL on my HP laptop but cannot boot up. I've gotten to the step where I have my USB stick turned into a working booting SL operating system. When I try to boot it however I can only get to the Apple screen (white backround with gray apple in middle) and that's it! It doesn't go any further than that. Anything else I need to do or that I missed? Specs for laptop are: AMD Athlon II, Win 7, 160GB HD, 3GB RAM