I'm trying to help out a friend using an old iMac using OSX 10.7.5 that appears to have a dead wireless keyboard. I'm not sure what model number the computer is but am sure it's well over 10 years old. We put new batteries in but still no response from any keys. I know very little about Apple computers but searching around in this forum I found a few threads that suggest the problem is the keyboard and not the computer. I was hoping for some advice on how i might confirm this. Also, is it possible to get a cord keyboard instead as an option instead of the wireless? Otherwise the machine functions normally.