How to erase a MacBook from a pawn shop ?
Here's a synopsis of what I'm dealing with. Ive never owned a MAC before so I thought instead of spending a grand for a new one I would see if i could find one locally. so I purchased an early 2008 Black MacBook with OS X 10.7.4 Lion from a local pawnshop. The person who had it before me was still logged on and it had all kinds of accounts set up and such. So I went online and researched how to erase all of that. I did the restart holding the option key which brought me to the MAC OS X Utilities. I selected Disk Utility then selected Macintosh HD and then the Erase Tab. After that I clicked security options and then selected single pass of Zeros. Clicked ok and the clicked erase. It took about an hour and then I selected to erase the free space. After that I went to to the MAC OS X utilities options box and selected Reinstall MAC OS X. All said and done its now asking me to input my Apple ID and then it says my ID has not purchased the operating system.
Now what do I do ?
Do I really have to go to the iTunes Store and buy lion ?
If that's the case Mountain lion is only $20 will that work as well?
Once I purchase the software, do I go through the motions again to have it installed like before ?
Should I just buy a hard copy rather than doing it over the Internet ?
Much needed help would be appreciated. I've spent days working in this and now my GF wants to kill me. I need this fixed soon.
MacBook, Mac OS X (10.7.4), Black MacBook early 2008 model