OKAY, so here's a good example of what NOT to do when you were in a situation like mine... A week or so ago, I posted on here, asking help for a problem I had with iTunes in Lion DP3...it wouldn't work no matter what i tried. Someone had suggested I had an old version of iTunes, which did not match the one I should have, when using Lion DP3. I decided (stupidly) to download Lion DP4, hoping this would solve any problem I had with iTunes, and ultimately assuming once I had DP4 installed on my Macbook, the DP4 version of iTunes would be included in that. So I went ahead and installed DP4, without backing any of my stuff up, not even moving my important documents onto a seperate USB or anything. Anyways, my Macbook boots up, and up comes the start page with 'Mac OS X Utilities' on, giving me options to repair my disk, restore my machine to an earlier point via Time Machine, get help online, or install Lion 10.7. So I click on install Lion 10.7. Nothing. It comes up with a message 'an error has occured in the installation'. Through panic and fear I (stupidly) went back, and clicked the 'repair my disk' option...I went ahead and (stupidly) restored my hard drive. This means everything of mine is dissapeared, all my Uni work, music, applications. Now that isn't the real problem, I'm not too hurt about the hard drive going, my Macbook was only about a year old anyways so I didn't have that much on, plus I have just finished Uni so I'm not going to be needing my saved work anytime soon. However this doesn't solve the problem of how to get my Macbook working again. I have tried several times to use the 'Install Lion' option, but it never works. I would really like my old Snow Leopard 10.6 system back thanks. On Friday I ordered a new Snow Leopard Disc from Office Depot online, My Macbook didn't come with a disc because I received it off a friend, who had lost the disc. So I am now wondering, once I get this new Snow Leopard Disc, will that boot up my Macbook with Snow Leopard? Or is there any chance this isn't possible as there is already a Lion drive on the Macbook (drive, not a CD) and you cannot downgrade, technically, only upgrade to a higher operating system? And if this is correct and I am wasting my money buying a new Snow Leopard Disc. Has anyone got any other idea to help me get my Macbook back up and running? Yes, I am a typical example of someone who thinks they can download whatever and just put it on my Mac, this has tought me not to play around with stuff I don't know now... Cheers!