Sanyo dvd v100e will not record onto dvd

As in most dvd or cd players for that matter, there is a switch that is made when a dvd or cd is present. After the disc is loaded and the door closes, it makes this little switch inside the player/recorder. Another cause of this problem is that the lens that actually reads the disc is just gotten to the point that it is too dusty to read and therefore it say there is no disc. To solve that problem I take the cover off (just a few screws readily seen), and I first blow out the dvd player with a can of clean compressed air with a small straw attached. There will be sufficient dust in there after three years to notice once the compressed air hits it. After the dust settles, you can see the little laser lens in the carrier where you put the disc, clean it with a q-tip dipped in isopropyl alcohol, then turn the q-tip around and dry the excess off the lens. With the cover off load the disc and make sure as well that it starts to turn. The dirty lens would have kept it from starting to turn as well since it could not see the disc there to begin with. This should get it to work. Good luck and God bless.