First off you didn't say if the pictures it is taking are OK, or if they are also black. If the pictures are turning out fine, then it's likely that you just accidentally pressed the DISP or DISPLAY button on the back of your camera, accidentally turning the screen off to save batteries. Press the button one more time to turn it back on.
But if the pictures take are also black, then 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.
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