So I bought a MacBook off eBay with 10.4, so I wanted to get 10.5 just because I knew that it could run it...so I go on eBay again, find a good deal on a new copy of OS 10.5, get it home, it says, "OS 10.5 cannot be installed on this computer". Doesn't make sense, because it says right on the cd "For Mac Computers", not iMac or MacBook... Hmmm... I didn't get some kinda copy off of a person on eBay did I?! Because if I did, I'm demanding a refund and filing a complaint against them. Sheesh.