Hi everyone, I recently use an iMac Late 2009. I accidentally installed Developer version of 10.7.2 Mac OS X Lion, considering it is the official one. After giving it a look on the net, I found a way to go back to 10.7.1. After that I installed the official one. No problem till here. The keyboard issue began after that. F1,F2,F3,F4,F5,F6,F7,F8 and F9 do not respond. I checked it using virtual keyboard on MAC and I can't click on these buttons on the virtual keyboard as well. Yesterday, I upgraded my iMAC to 10.7.3, but nothing changed. So any suggestions for the issue?