"Why does the up button on my acer c720 keep popping off?"に関する回答The buttons on the keyboards sometimes have little tabs on them that keep them in place on the computer, if one of the little tabs has broken, then it would not stay on the keyboard. Look at the bottom of the button, usually its a small round area with a few small tabs or a small hinge like device. If either one is broke or missing, then the key won't stay on by its self. You can more than likely replace just that one key, or the entire keyboard.
"brake lights don't work when I press on the brake light pedal"に関する回答I do believe this is correct coloring for the wires. More than likely it would be a wire or a fuse issue if you have replaced the switch on the pedal already. Green = right side stop light/turn signal Yellow = left side stop light/turn signal Brown = tail lights & license plate lights Light green = backup lights Black = ground