http://www.videohelp.com/

Try this site when you get a chance. Users comment on the media types they
use and what players they are compatible with. This situation is really odd.
It could be the disks aren't spinning properly, almost as if they had a label
put on off center. If the Dynex didn't work on either player but worked ok on
your pc, then I'd lean toward using different disks. All disks are not
compatible with all players and sometimes we run into these situations.

I had a similar experience with a Sony CD player. It all of a sudden
wouldn't read my commercial disks. I sent it back to Sony and they had it
playing in their office when they called me. So they sent it back. I put a
new disk in and it played. Then I went to an old one and it stopped playing.
I finally got rid of the thing. Not to say you should toss your players, but
try different disks. See on the above site if there are any recommendations
for your players.

Try the Sony DVDs for your Sony player. I have had good luck with the purple
label DVD+R. They even play on my old Magnavox player. I remember reading
good/bad about memorex. Depending on the color of the cake stack bottom
(purple or black) one was a good quality disk and one was a bad one, but I
don't remember which.

If they all play well on the PC then it still comes down to a disk, player
compatability. Cheaper to replace the disks, than the player. Once you find
one that works, stick with that brand. I've heard many times on this board,
you get what you pay for. Sometimes buying a certain disk because of the
price, doesn't get you quality burns. I assume you've had no issues with
commercial disks on your players, right?