The other day whilst eating dinner I was fooling with the settings on my camera and something sticky got on the lens and...

I have been referring to your battery door replacement guide and have gotten to the part that says remove the back plate....

The first thing you should do is see if there is physical damage to the camera. If there is not ensure the batteries are correctly seated in the camera and are not dead. If there is physical damage or the camera screen will still not turn on you will want to refer to Troubleshooting Page and then if necessary the Screen Replacement Guide.