I have two MacBooks, early 2008 model, which have a common problem. The Command-Q to quit an application does not work. I've tried connecting an external keyboard, same problem, I've made certain that all updates are applied. One is Snow Leopard and the other is Lion. Command-Tab works. Command-W works. Just Command-Q that doesn't work. Any ideas?
OS X Mountain Lion (10.8), A few are stuck at 10.6 or 10.7.