Check the manual available [http://www.keepandshare.com/doc/2919171/sanyo-dp50747-pdf-june-28-2011-12-12-pm-6-6-meg?da=y|here] I am not sure if you already checked the power failure circuit. This unit is equipped with a power failure detector function and will turn your unit of to protect from further damage. Good Luck. Also check [http://www.ifixit.com/Answers/View/58850/Sanyo+DP50747-01+no+video+or+sound#comment52326|this post]