I found the solution. The power button is stuck. Just flick the power button a bunch of times with your finger. If that doesn't work try compressed air, shoot that in there a bit, so it gets unstuck.
If you spilled soda in there maybe try getting an alcohol wipe and try to wipe it down a bit (make sure battery is off) maybe squeeze a very very small amount of rubbing alcohol in there. I mean very small amount, then wipe with Q tip. The flicking technique works for me every time.
