I would check the battery to make sure it didn't die on you... If you never replaced the battery then it is probably very old and may have died on you... Batteries have a life span. CHeck the voltage first before you do anything. Next i would check the terminal connections inside the battery cage. This is an old camera and if you store the battery in the camera 24/7 the terminals can get pushed in and overtime will create a gap between the camera and battery terminals. With the door open push the battery inwards while attempting to turn the camera on. Do these steps first to eliminate possible battery or terminal issues and keep us posted.