About a month ago my Macbook Pro keyboard and trackpad stopped working when the battery was in the laptop. However, when I take the battery out and keep it plugged into an wall outlet, there are no problems. A USB external mouse/keyboard work fine, but its not easy to bring them everywhere I need my laptop. This may not be relevant, but when the mouse and trackpad are not working, the screen still dims when I place my hands over the speakers. I have bought a new battery, hoping that was the problem, but it made no difference. I can't check to see if my software is updated, because my software update is also functioning incorrectly. It takes an average of 5 hours for the software update to search, and it always comes up with "no available updates." Any suggestions or recommendations would be great, and very much appreciated.