I bought a MacBook on Ebay. It is 2.4 Ghz, 4Gig of RAM. I am running OS 10.7.5. When I look at "About" it tells me that it is an early 2008 MacBook. When I log onto iTunes it recognizes the computer as a MacBook Pro so I paid Apple for the 10.8 upgrade. When I downloaded and tried to install it said my computer was not compatible with this upgrade. I called support and explained the issue. They told me that in fact it was not compatible so I asked for my money back and was refused because they said that I had redeemed the download. I am pretty upset over this and will dispute the credit card charge.