Hi, it seems that other people recommend that you remove the battery (or batteries if there is a smaller round battery asd well) to let the camera "forget" that it had an error condition. Here is a thread that deals with the error condition C:31:XX, but there is also someone who had the C:21:00 that you mention. http://www.globalmediapro.com/av/messages/135625-3.html

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