Need Help! rig works with any miners except for ccminer?

[U253]

Hi, all

I am wondering whether anyone could kindly help with this.

I have three rigs running while one of them is never able to work with any algorithms in ccminer (either stand alone ccminer or that integrated in Nicehash). It's really wired and I could get benchmark in nichhash but always failed to start mining with ccminer.

No problem at all with EWBF miner (zcash) or Claymore ETH miner.

Specifications:
CPU: I5 6500
MB: Asrock H170
GPU: 2 * 1080 Ti

I have tried to modify bios setting (change PCIE to Gen1 or Gen2, et al), or just plug one GPU on this rig, but never got the ccminer working.

many many thanks for any feedback.