I too received the hated c:13:00 message on my SONY. It is a DAV-S800, a good machine, decent design but maybe now quality is an issue. I have read a number of forums on this error and the first suggestion is to enter the Service Menu and make adjustments to Single layer then Dual layer. However, the Title, Clear, Standby button does not seem to work on my unit. As it is in standby mode it doesn't react at all unless the standby power is pressed first. Anyone know how to get into the service menu on this particular DVD player. Thanks in advance.