hi guys - all of a sudden the left control, alt and I keys are no longer working on my macbook. To my knowledge the computer has not gotten wet. I have ruled out software problems and the other common problems listed on apple's support page but still no luck. (turn off slow keys, make sure not accessibility options are interfering etc) When i bring up the virtual keyboard these keys don't appear to be working at all. I have read that a shorted keyboard, even if it's just a few keys, would require an upper case assembly which is expensive. as this is an aging macbook i'm not sure i want to go that route if at all possible. An external wired keyboard works fine. Any ideas? Time to visit the fruitstand? thanks!