Philips DVDR75/17 problem

[qanda]This thread is about the Philips DVDR75 DVD Recorder. Click here to see full specs[/qanda]I have had problems with “disc error” or “unknown data” appearing after recording with this unit for some time. Yesterday, right after successfully recording a movie to disc, I attempted to record another. All channels, camera and external inputs showed “no signal”. Is this unit now incapable of functioning? It is about 2 1/2 - 3 years old.

Any advice on way to correct problem or if problem can be corrected would be appreciated.