I'm thinking that it is a problem with this type of CD player. I also have a Kawasaki 5dvd players and it does the same thing.
I has something to do with the way the DVD was recored.
Try pressing the NTSC/PAL button on the remote control. The Unit and the disc region numbers are incompatible.
Sometimes this works, sometimes it doesn't.
Good luck.
I have one particular DVD that will play in everyone elses DVD player, but my players gives me an invalid disc message.
tvanderwor
January 2006