I found 2 proposed fixes while doing a web search:
The first, said to open up the DVD, …(missing steps here) .…, gently push the head back.
The second said to out in a brand new unformatted DVD in.
I tried the second since it is easier. It didn’t work n the first attempt but took 2 tries and then worked. So I guess one should not give up after the first attempt but should keep trying it several times.
Adolf, February 2010