dvd backup help

after backing up several movies using different media they play sound in my sons portable bush player,but when i try playing them in my scan sc2000 it comes up with no disc,the same happens with my crown 1100 player. i have tried different progs like clone nero dvdx express is there anything i can do to sort this annoying problem out, many thanks rob : :
 
The-poacher said:
Use Only top media (I use Ritek with G04 dye)
thanks poacher i have tried packard bell,datasafe and ritek grade a media and i still have the same problem,any other suggestions?
 
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