My wife's Macbook is intermittently not registering the keystrokes of certain keys--namely the spacebar--but also a couple of alphanumeric ones. She promises nothing was spilled on it and it doesn't seem widespread enough to be caused by turning keyboard navigation accidentally. When it happens the problems persists as long as several days until it magically goes away. It does seem to happen more often when she takes he Macbook to work or somewhere else with her so she's been keeping it at home all the time now which is annoying limitation for a laptop. Any ideas? Any one ever have a similar problem? Could it be an internal ribbon cable that's not secured?