Summary: I normally love SONY products, but I too have suffered with a 2-year old SONY dvd player which now fails to be able to read DVD's, instead giving the dreaded C:13:00:00 failure, whatever this means (I interpreted it to mean unable to read TOContents, so I was forever cleaning my disks hoping it was just dust!). I have never been unhappy with SONY elecronics before, but I certainly am now. Stay with SONY on other stuff, but consider a different brand for DVD technology.
Summary: I have a Panasonic RV31 which is supposed to be very good. Well all of the sudden it starts giving me a no disc error or can't read this type of disc when I know the disc inserted is correct. I am very happy you reported this problem with the Sony and Panasonic models before I broke down and bought a replacement. This is the third DVD player I've had to buy. Why can't they just make products that work and last for a change? Thanks for the info.