There may be times when keys do not behave as expected. Depending on the circumstance, the keys may either type the wrong character or perform some other function. Apple Discussion poster "tommcnealy" ...

Keyboard problems (keys not recognized) We previously reported on an issue where (for a small number of users) the MacBook Pro's shift key is unresponsive. In most cases, users experiencing this ...

Many computer problems are tricky to diagnose because there are so many potential causes. In fact, it's often not apparent whether a problem is being caused by hardware or software. Such is the case ...