I upgraded my Mini no problem, then I put the install disk in my MacBook and started the upgrade. All appeared normal. Came back about an hour later, and the MacBook was asleep. Woke it, expecting to see the new login screen, but I got the old login screen. Logged in, and did not see the welcome movie or anything to indicate the new OS. Checked 'About This Mac', and it says OS 10.5.8. Before I started the upgrade I had about 11.5GB free on my 80GB hard drive. Now I have just short of 10GB free. There is a folder on my HD titled 'Mac OS X Install Data' with a 'date modified' of today (all other folders have older dates) -- it appears to be mostly .pkg files, the biggest of which are 'Essentials.pkg' (841MB) and 'BaseSystem.pkg' (625MB). Can anyone tell what went wrong -- why when the computer restarted it's not running 10.6? And, maybe more importantly, what should I do now? Run the installer disk again? Could it be that I didn't have enough free space on my HD?