Your lens didn't reseat and now it cannot deploy properly. You may be able to get it to do so by using a finger nail or with a piece of tape stuck to the front and gently pulling outward while trying to turn it on. If you can't get it to come back out you are going have to do some surgery and open up the camera to get to the lens assembly. Use this lens removal guideto take it apart.

Is the camera still working? If it is you may just have some water shorting out the contacts on the micro USB port. Take out the battery and SD card and open all the little doors/covers and let it sit in a sunny spot inside your home for a few hours and then try again.