*Fixed Updated 7/29/2011 Guys I have a 500GB internal HDD partitioned with 32GB for Win7 Boot Camp, the rest going to OS X. I committed an upgrade install from SL 10.6.8 to Lion 10.7. Noted one issue in the install log when it came time to migrate my user data, but thought nothing of it. Upon reboot, I get the spinning wheel with logo for a couple of minutes, and then a "No Entry" / "Do Not Enter" sign. I understand that this is bad news. I tried running in Verbose and Single User Mode, but the boot hangs up at one point. I get a message "Still waiting for root device" and the rest is history. Booting into the Lion Recovery Partition, I have access to all the utilities. I run Disk Utility and note that my former OS X partition is unmounted. It also claims that the file system is FAT32, which is a blatant lie. Come on, disk utility. Disk Utility claims that the disk has errors beyond its ability to repair and gives up. I downloaded some software for Win7, MacDrive 8, which claims to have repair tools for Mac drives. The weird thing is that MacDrive 8 recognizes the OS X partition as HFSJ file system, and allows me to navigate its contents. What should I try next?! --- FIX --- Installed SL on an external harddrive and booted Noted that Disk Utility still maintained that original OS X partition was Windows format. Blatant lies! DiskWarrior refused to touch it because it wasn't HFS So the solution? Followed the advice given on: http://osx86.sojugarden.com/2009/10...f-you-broke-it-with-the-chameleon-bootloader/ Worked for me!