I have Mac OSX 10.4.11 on a 1.83 GHz Intel Core 2 Duo Macbook. I just got an iPhone 4 only to discover that I cannot synch it with my computer. To synch I need to have the latest version of iTunes, which my computer tells me is up to date. I then discovered that to get the latest version of iTunes I need a later version of OSX. I tried upgrading using my brothers Snow Leapord Disk, but it gave me an error message that said I need to have 10.5 installed before I can upgrade, which according to the internet should not happen. I have found people with similar problems who have suggested absurd things like removing my Hard-Drive, which I don't want to do. I then tried to use the software disks that came with my brother, and my mother's macs but that failed as well. Everything I have found has been unhelpful, suggesting that I should have no problem upgrading straight to snow leopard. Do I really have to go drop even more money on 10.5 or is there some way of getting one of these 3 disks to work? Please keep your response elementary, I don't understand a lot of the tech jargon. Thank you in advanced!