So my girlfriend's powerbook g4 has a crack on the "enter" key on the bottom right of her keyboard... the key is pretty much cracked in half almost, it's so annoying - both of us have no idea how it happened? my question - is it possible (hoping hoping hoping!) to replace a single key (the "enter" key on a keyboard? or do I have to replace the ENTIRE keyboard? below is an image of what i'm talking about... also, if i manage to find a single key - is it hard to replace them?