Hi all, I'm hoping you all can help me out with an issue I'm having with my girlfriend's mid 2009 13" Macbook Pro. Last night she tried to start the computer and was greeted with the grey folder with the flashing question mark icon. She (of course) did not have a back up, so I swapped out the HDD with my MBP and it did boot. I backed everything up with the intention of doing a clean install of 10.8 and then restoring from that back up. This morning I put her HDD back in her computer and tried to do a clean install. However, the installer cannot find the HDD at all. Now I'm stumped. If the drive was the issue, wouldn't the same problems be present on both computers with the bad drive in them? Currently I'm using the "bad" drive in my own MBP repairing the disk permissions. Does anyone have any suggestions? Any help would be greatly appreciated.