Digital noise on 888/24 inputs 1&2

[nickair]

Hi, I have a ProTools Mix system with 1 MixCore, 3 MixFarms and one DSPFarm.
I have a 888/24 (A) attached to the MixCore card, a 1622 (B) to the first MixFarm and a 888/24 (C) to the second MixFarm.
Whenever I try to send signal to the input channels 1&2 of the second 888/24 (C), I get loud digital noise. It works fine if it's connected to the MixCore.
I also tried to combine the cables between the audio cards and the 888's. The worst case is that all inputs and outputs make this loud digital noise. The best case is that everything works fine, but these 2 inputs.
It used to work fine until now. Suddenly it started doing this thing.
Anyone can help?

Thanks.
Nico

[Craig F]

damaged pins in the connection cable would be my first guess.

[nickair]

Thanks for your reply.
I'm pretty sur it's not that because if I attach 888C on MixCore and 888A on MixFarm, 888C has no more problems, but the problem appears on 888A. And if I change only the cables, the problem can be even worse.