I would like to know the same. I have a PDV-0701A. It just over night started saying there's NO disc regardless if it's a dvd or music cd. I did notice next to the pc that moves there's a black or grey plastic pc attached to a thin "sensor" type cord going into the "eye". Kinda looks like that broke or something but then it's not long enough to reach from where it goes and to the edge of the spot the dvd goes.
If someone can tell me how to fix it email me at: miami000@centurytel.net.
Thanks
Lisa Ahart, December 2006