Olympus Pen Lite E-PL5 problem

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I bought one of these cameras from MPB some time ago - no longer under warranty - and it has developed a problem. The shutter is stuck in the closed position and will not budge at all. Normally, the shutter is in the open position, allowing me to see the sensor if there is no lens attached. I have tried leaving the battery out for two days to see if this would help and I have tried a firm rap or two on a solid surface to see if that would free the shutter. Neither had any affect.

Has anyone else had this problem and if so, how did you deal with it? This camera is now quite old and I am loath to spend a lot on repairs for a camera that might be at the end of its life.