hi there, i'm having some troubles with my macbook keyboard and i don't know what can i do to see where's the problem. strangely, i only have this problem when i work with battery or battery+electricity. so, i have a regular keyboard when i use my macbook without battery. but enough talking. problem is: some keys from my keyboard don't work when i'm running on battery or battery+electricity. they are, for example: caps lock, space, backspace and other peripherical ones. other work perfectly as enter, letters and numbers and the f's. any idea? thanks in advance.