Hi Maegan, the Nikon N80 is a basic, barebones camera that is great for amateurs and professionals alike. Because of its basic features, the camera itself come with a zoom feature that may become jammed if carried due to everyday debris. Gently turn the zoom button and see if this will dislodge any debris. The N80 also uses accompanying lenses in order to zoom in or out so make sure that you are using an appropriate lens for what you are attempting to photograph and that the lens is in good working condition.
Hi Maegan, often times when carrying your camera with you throughout the day, or even just having it sitting at home, dust and other foreign objects can become imbedded within the camera. Try gently clearing out all the spaces by the power switch to get rid of any dirt or dust that may have accumulated throughout your travels and make sure the power switch can move freely. While you mentioned that you had tried charging the batteries, I would recommend that you try other batteries and make sure they are each in their correct chambers as well as making sure the chambers are free of any debris.