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DM800Hd need good null cable not as like DM500s or c
So:
1-Try another null cable
2-Try another pc (win xp better)
If read another topics you will find most of the problems from connection (Cable or pc)
So:
1-Try another null cable
2-Try another pc (win xp better)
If read another topics you will find most of the problems from connection (Cable or pc)