A: Make sure the lens cap is off.
B. Check that the drive mode is on "S" for single and not "C" for continuous. This won't correct the black images but will let it take just one exposure when the shutter release is pressed.
C: Make sure it is not in manual mode but with the shutter speed and f-spot set to where the images are so under exposed they appear black.
D. Send more info about the make/model of the camera.