Sounds like you might have accidentally pressed the DISP or DISPLAY button on the back of your camera. This manually turns the screen on and off to save batterie (you would then use the optical viewfinder in its place). Press this button once to see if it corrects the problem.
If the above didn't help, a stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, especially when taken outdoors (for shutter stuck open).
To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link
for further info and a simple fix that may help.