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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, sometimes with lines, 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.
No.. someone sent me copies of photos of the mechanism. In my case, the little level that controls the aperature is not going back into place but no one seems to know how to take it apart and reset it. I will eventually take it apart very carefully (you know how springs just jump out at ya). When I do I will post it. Don't hold your breath right now as I'm recovering from surgery but I expect sometime towards the end of the month.
No I don't believe it is your shutter, more than likely it is a LCD Screen problem. I would suggest you take your camera back to the shop where you purchased the camera and have it serviced under warranty.
I had a customer with an Optio 550 come in and it looked like every shot was taken through 'venetian blinds' and the problem was with the LCD Screen and the camera was sent back to Pentax and repaired under warranty.