I just got the game Mafia for mac and wanted to configure my xbox 360 controller to use so I installed a preference option called 360controller. I've done this before on Lion DP3 and all was well. I am now using the GM version and when it was time to restart to finish installing the 360 preference pane option, i restarted but i got the "no smoking" sign type error instead of the usual apple logo.. I know it is not my hard drive since I am using it now. (i backed up the corrupt OS on an external and copied a new OS onto this hard drive to make sure) I do not know why this happened but does anyone know how to fix this so I can go back to using the OS i started with? I was guessing it did something to boot files somehow that may have gone wrong when the install restarted my computer.. I do not know much about this stuff and don't want to do more harm. all info is much appreciated also, i did use disk utility to verify and repair disk but to no avail.