Video Playback / Recording Devices

My Panasonic F87 dvd player has stopped giving me a video signal. When a movie dvd is played all I get is an audio playback. The CD function is not on and the TV is set to the correct channel. I think this points to a problem with the video laser. The warranty has run out. I would like to know if there are any things I can check. I am an electronics tech that works on industrial equipment but have little experience on home electronics.

No matter what DVD I put in the machine my player keeps attempting to read the disk then gives up and displays the message "H07", or "K07" its hard to tell on these things. This applies to the cleaner disks as well. Afterwords it justs stops and sits there stupidly.

I just bought the 5-disc RCA player (DRC510N). The problems is that I can get everything to work on it but DVD's. It has a list of about 12 compatible disks but everytime I put in a dvd it says that either there is no disc in the unit or that it is not compatible and to try another disc. I did however get most of the WB disks to work and so I know that all the hookups are correct. Should I just take the unit back for an exchange assuming that it's just this player or will the next one do the same thing? OR do I have something screwed up in the hookups that could fix all of this?