As you cannot navigate in your camera, it is not possible to reset your camera using the menu option so hopefully by performing the following procedure it may reset it. It doesn't take long and if it doesn't work you've only lost a bit of time.
Remove the battery, press and hold the power button for about 10 seconds, release the button, reinsert the battery and turn on the camera to see if it works normally.
If it doesn't work, see if you can reload or update the firmware in the camera in case it has become corrupted.
Here is a link that shows you how to do it. If you have already installed i-Launcher on your PC you can ignore the first section regarding the installation of i-Launcher. If not, as the Connectivity > i-Launcher (PC software) option in the camera is on by default, hopefully it will still be able to be installed