DEW is a term that is used in camcorders and vcr's to indicate that moisture is present within the mechanism using a sensor within the mechanism chassis and the vcr or camera will not operate while this is active to prevent damage to the mechanism/tapes. In your case the camcorder is simply giving you the tape back as moisture has been detected and this can be due to the obvious or a faulty sensor. If it does not operate after being in a warm room after an hour then contact your dealer to have the sensor checked/replaced.
Tom
November 2006