2070 supers cuda issue

Hello!
Today was changed my cards order in the risers and now have this error message:

“Can’t start miner, can’t initialize CUDA engine, code exception: CUDA_ERROR_NO_DEVICE. Is NVIDIA driver installed?”

I’ll tryed a lot of methods but all failed.Changed risers ,put 1 card on motherboard with and withnout riser,but notning ,psu cables dont have problems checked all,but cant solve it,help me pls!

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