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Those cables can go bad easily. If you have a meter and know how to use it, try to test continuity on each pin. If that isnt the answer, then either the input of second monitor is faulty, or output of main screen.
Burning dvd\'s is always a crapshoot when you have multiple machines. Computer drives are more tolerant on playback - the problem lies with your other, independent playback units. That is why in your main viewing area it is important that you have a few units so that if disk does not play in one machine, it will play on another. Has to do with the individual differences and calibrations of the machines involved. Store bought dvd\'s have less problems because their laser reflectivity is always higher than disks you burn, and therefore, easier to read properly. Price of the unit has no reflection on ability to properly read the disk. Sometimes and often, a cheaper machine will work better with copies - you never know.
it sound to me like you have a broken connection on yourvideo out jack on the main unit becouse you say the lead is fine and the tv screens work with another unit.this can be caused by the plug being pulled out in a wrong angle. ask an audio dealer to chech the solder connections in the unit to see if they are making a connection with the pcb(printed circuit board. hope this helps