All my photo's from my nikon d70 are black?

Can anyone help me please, I have a Nikon D70 which I love, now suddenly this week all my photo's that I take come out all black. I've changed the battery, formatted/changed cards, and reset by the button under the camera, cleaned the contacts on the lenses to body, I've made sure the shutter is working and the mirror lock up too… All with the problem still there. Can anyone help me please?

Added (1). I've tried going through all the different shooting modes but still the same problem.i've seen similar problems reported on the net but yet to find anyone with an answer

Are you on a manual mode? Program mode?

black photos means massive underexposure

set your camera to auto mode and shoot in nice sunlight. If you still get black pictures, it is time to call Nikon and ask them. You will probably have to send it in if that is the case.