Same for me, as I have written a few pages back in this topic...
Try this one as I have also written in my quoted text(maybe try replacing 1 with 0):
sgminer.exe --gpu-platform 1 -n
yes. it worked and I see my cards..
sig-miner>sgminer.exe --gpu-platform 1 -n
[00:08:06] CL Platform vendor: NVIDIA Corporation
[00:08:06] CL Platform name: NVIDIA CUDA
[00:08:06] CL Platform version: OpenCL 1.2 CUDA 8.0.0
[00:08:06] Platform devices: 6
[00:08:06] 0 GeForce GTX 1070
[00:08:06] 1 GeForce GTX 1070
[00:08:06] 2 GeForce GTX 1070
[00:08:06] 3 GeForce GTX 1070
[00:08:06] 4 GeForce GTX 1070
[00:08:06] 5 GeForce GTX 1070
[00:08:06] Unable to load the AMD Display Library
[00:08:06] 6 GPU devices max detected
but sgminer dosnt start
sgminer.exe -k skunkhash --gpu-platform 1 -v -o stratum+tcp://pool.hashbag.cc:8644 -u adddressss -p c=SIGT
just see on screen
[23:56:32] Started sgminer 5.3.3
[23:56:32] * using Jansson 2.10
no mining...
add -d 0, -d 0-5 - dosnt help