I just got the iPhone 5 and realized I couldn't update iTunes to activate it. Upon further research, found out its because I have Tiger and need to get to Snow Leopard to get to Mountain Lion. My friend has a SL install disk 10.6.8. I tried to install it, but got the message that it couldn't be installed. More research done, so I copied everything to my external hard drive and decided I would go ahead and delete Tiger to install SL. Unfortunately, I got the same message that it can't be installed. I also can't access Tiger from my external hard drive because (I'm assuming) I copied and moved to the drive instead of processing as a backup. I can't get the SL disk out to reinstall the original Tiger, either. Can anyone advise how to get SL working?