Help! First time in my 20 years Mac-life I have such a crazy problem. Downloaded Lion from Mac App Store and sucsessfuly installed on iMac i5 quad and MacMini 1.83 Core2Duo. When I tried to install on Mac Pro 6-core 3.33Ghz/24Gb After restart Mac hang on "Install" screen. Inside MacPro I have 5 drives I tried to install on 3 different drives. After bad attempt I did clean install of SL, and tried to install Lion on fresh system (I did all updates before installation) same result. Next time I took out all hard drives left just one, it didn't helped at all. I give up after 5 attempts this is not have to be so crazy. Again, on iMac and Mac mini everything works right away. Any ideas what can't be wrong? Thanks in advance.