MSI Afterburner doesn't reflect a 1070 - just says Internal Graphics. Same with Device Manager.
My 1070's led's are lit, and fans running.
This suggests the problem is not power. I also assume if the power connector is labelled for a specific slot
you only need to connect power for populated slots.
Test with a known working GPU if you have one or test the 1070 in a different system to prove it works.
Try a known working card in another slot in case you have one bad slot.
JayDDee,
Thanks for the help, I am 100% positive the card works, I had it in my test mining rig (man that thing is a hack job), had it running 29.4 MH/s on Phoenix Miner 2 days ago. I totally agree with your advice, and that's why I put this old card in a running PC and made sure it worked before I started playing w/ a motherboard I am unfamiliar with.
Eule.......I think I did........but give me a sec, I will try again......