If this happen to your camera the problem is the image sensor.... log to sony website and go to the customer service..find the model of your camera if it is one the recall product due to the factory error....do not worry they replace it for free...:-)
Here is the link for the operating instructions if you need it; http://esupport.sony.com/US/perl/model-documents.pl?mdl=DSCP200®ion_id=1 Check page 74 for the reset instructions - You have to push in the reset button next to the card slot under the cover with a pointy object. If this doesn't help, please post back any details of screen flashing/messages/lights etc. hope this helps :)
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