I've been pulling my hairs for hours.. I purchased a new mini today and immediately took out the 500gb it came with and replaced it with a western digital scorpio 750gb. I began by installing a version of lion i had in a bootable usb stick which I made when I upgraded to lion. The way I did this was by putting the new drive in an external HD enclosure and booting from my MBP. Little did I know long and behold when it was done and I put the new drive in the mini to my surprise I get the white screen with the circle with the line through it (similar to the no smoking ones...) doing some research I find out that the versions of lion differ from MPB and mini. I tried to super duper the drive but didn't seem to work. Also, when I put the new 750gb inside the mini and hold option it boots into the recovery screen but then it says cannot install osx please reinstall... I've been going crazy and maybe I need to see things from a different perspective. Any help would be appreciated...