I have a very strange problem, maybe not only related to my new ND-2500. I have successfully burned several DVDs that works fine on both stand-alone players and other DVD-R/RW units - but I cannot play them on the ND-2500 itself! I got a message about "possible scratched disc" or similar.
When copying back the files from the burned disc to my HDD, I can play it from the HDD without a problem again.
I am using Nero 6.0.0.x and Power DVD, and burning and reading of data from/to the HDD seems to work OK. I cannot understand why I cannot play burned DVD-Video. Reading/playing other DVDs, even burned by friends, is not a problem either.