My aluminum unibody macbook (mid or late '09 i think) wont boot to Lion anymore, just freezes at the loading screen. My bootcamp partition still boots fine. I attempted to use disk wfrom both the DVD and the "rescue" partition that you can boot to from the laptop but it wont let me even try to attempt to Repair or verify permissions. If i do "repair disk" then it fails after a couple minutes and suggests backing up as much as possible and formatting the drive. Im fairly sure i know what i did that caused this ( yes im full aware that its my fault). I was attempting to explain the installation process for MacDrive ( a program that allows windows users to access HFS+ disks and partitions) to a friend and they needed literally every step outlined so i did the installation in bootcamp as i was explaining it to them, not even thinking about the fact that i was screwing with the same drive I OS X on and God only knows what type of havoc ensued from all the permissions and modications it made. Also it doesnt appear that the OS X partition is mounted when i open disk utility. Any suggestions? Any way to repair or attempt to repair things or any other methods or approaches within disk utility i should try. I can do a clean install here im just trying to decide on the best approach. Ive got a terrible migraine so my mind is pretty fuzzy, but could i do a "upgrade" of lion on top of the existing installation withotu deleting all the files or the Home folder and if so would i want to do that or are some of the changes caused by the installation of MacDrive to "deep" for that? Thanks guys for any tips. ----To clarify the last statement/question. Am i right in thinking that i could use the Install DVD and do a "upggrade" of sorts, of the same version of OS X Lion, that would re install the OS and still keep the file and the home folder and all that or am i way off?