Okay, so I posted a problem on another part of this forum about my Macbook Pro not being able to install DP4 (I messed my Macbook around quite badly installing stuff I didn't understand, and now when I try install Lion 10.7 on the start-up page, it says there is an error, so I would like to get Leopard back onto my MB if possible). I don't have the original Leopard disks that came with my Macbook, as it was given to me by a friend, and he doesn't have them. I do know my Macbook was shipped with Leopard though. Basically, I have the full Leopard 10.5 ISO file on my PC (Windows) and I could do with a step-by-step guide on how to get it onto my 250GB external hard drive and be able to boot up my Macbook with it so I can get 10.5 running. I know you have to format the hard drive also but I haven't a clue what to do (I'm pretty much a Mac beginner here) so if anyone has the patience to work with me on this I would appreciate it VERY MUCH Thanks in advance!