Just purchased a second hand macbook pro 2 weeks ago and the young fellow did not have a recovery disc but i didn't care as i have both lion and snow leopard and figured i would just wipe it clean and start over and then bring my data over from my older MBP and then sell that one This weekend was my first bit of time to do this but the password I was given does not work. I never bothered to check it as it opened and i turned it off once or twice and the password was not needed. so today i figured id wipe it clean and either install Snow Leopard from scratch and then upgrade to Lion for i have a Lion install I paid for from the apple store in December but my ex-husband was very ill and I had to step in until this past week to look after him so this is the first chance I have had to take a look at what I need to get done. But I cant remember if i purchased a full Lion or an upgrade since it was bought just before Christmas. Its just called 'Install OS X Mountain Lion.app' and is 4.4gb ok, looking up my records for that purchase I see I paid $19.99 in Canadian funds OS X Mountain Lion, v10.8.2 (4+) Apple Canada, Inc. App $19.99 I dont know off hand if that is an upgrade or a full version? Perhaps someone else here knows. In any event I put in my Snow Leopard disc with the intention of just cleaning it to SL and then upgrading to Lion But it first told me i could not install it, the Snow Leopard (I am guessing because i had a later disc installed into it) So I tried disc utility to erase the hard drive figuring i could then install the snow leopard and upgrade to Lion But wherever the hard drive discs were, were greyed out to erase so I was unable to do so. It also has a boot dual Windows on it I should add which i don't wish to keep on and personally don't understand why anyone would put one on a mac but its the first time I have seen it installed one one I have used or purchased So it seems i now need a password so I tried to email the seller but since the ad is no longer up or hasn't been for several weeks my email didn't go though and came back so i cant reach the young man i got it from. So how do I go about wiping it clean? Do I need to purchase a full Lion to do this? Any ideas please? If its too technically advanced I would just take it into a computer store and have them do it for me if need m Thank you in Advance!