Wont play on my dvd player help

i have just bought a new pc, on my old system i could burn a couple of avi`s to a dvd as an iso using nero and it would play on my dvd player as it can play divx and mpeg 4 etc, but on my new pc i burn the same way with the same program and same blank dvds and my dvd player says no disc? can any one help? thank you.

Could it be that your new writer doesnt like the disks your using?

could be, i will try putting my old dvd writer into my new pc and see what happens, cheers.