I have the same problem....well ALMOST....it doesn't happen EVERY time but almost. I called their "tech support" and they told me:
...."that the unit appears to be working fine."
...."try cleaning the discs"
...."the disc must be bad"
Here's the only hope I have found. I am going to try what M Norton says in this post.
http://www.amazon.com/no-disc-error/forum/Fx2EF9NC47LS3JN/Tx3TGUABVZR5R1A/1?_encoding=UTF8&asin=B0002DG0OA
which is...
"the eye or lens gets very dirty. try a otc cleaning product for dvds if that doesn't work take a q-tip and rubbing alcohol dip q-tip in alcohol squeeze excess out and with a circular motion clean the lens repeat the rubbing with the dry side of the q-tip and then wait about ten minutes. it should do the trick, it's always worked for me I refurbish systems and this is one of the most common problems"
Jason
August 2007