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Are the shots with both cameras taken with the same lens, or different lenses? I've got two initial thoughts, is negative exposure comphensation turned on, on the D40? If different lenses, possibly a stuck aperture on one lens.
Check ISO settings on each camera, Opanda reports ISO 200 on the D40, but shows no ISO speed listed for the D50. Having the ISO on the D50 turned up a couple of stops would make the underexposure difference between the two cameras, particularly with some bias towards underexposure to begin with.
With the lens off the camera, look through it, and see if the aperture is wide open. Manually, and gently, move the little lever (this controls the aperture in camera) that protrudes from the rear of the lens, while observing the aperture blades, as you apply gentle pressure and release it, the aperture blades should move quickly and freely. If not, the lens aperture is sticking.
Checking camera settings in your posted problem photos, there are 3 different exposures in four photos making a diagnosis from consistant results impossible.
The best way to diagnose this, is set up a controlled test, perhaps a still life using bright controlled lighting, some desk lamps for example so lighting remains the same throughout the test.
Using the lens that gives good exposures on the D50, shoot test shots properly exposed with the D50, then using the exact same camera settings, take test shots with the D40.
Repeat the process w/the D40 lens, assuming as i said, different lenses on each camera.
If both lenses give good results on the D50 and dark results on the D40 then its a camera issue, possibly settings as i mentioned earlier, or a camera fault.
If one lens gives consistant good results, and the other consistant bad results on both bodies, its a lens issue. ____________________________________________________________________
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