Hi everyone. I bought a iMac 27" on April 2010. It came with the wireless aluminum small keyboard (no numeric pad). Current Mac OS X version is 10.6.8 and I don't have to download any additional updates. Yesterday, everything was working fine. But today my "Z" key has stopped working. Not even Shift or Caps Lock helps. This is what I tried and didn't work: 1.) System Preferences > Universal Access > Mouse > Turn off "Mouse Keys". 2.) System Preferences > Speech > Turn off "Speak selected text when the key is pressed". 3.) Restarted the computer using Mac OS X installation cd. Used the Terminal to check if the Z key was working. No success. 4.) Slammed my head several times against the keyboard. 5.) I don't eat or drink near the computer. Mechanically, the Z key seems in good shape and cleaned. Even when I turn the keyboard upside down and shake it, there aren't any sights of hair/crumbs/boogers/dust/etc on the desk. 6.) System Preferences > Languages & Text > Input Sources > Keyboard & Character Viewer. The Z key doesn't work. Everything else does. 7.) The 2009 Aluminum Wireless Keyboard Firmware is up to date. 8.) I have Windows 7 installed on Bootcamp but rarely use it. I opened a Notepad file to see if the key was working but had no luck. On the control panel it says the keyboard is working properly and the drivers are up do date. What can I do? Thanks.