Glad I have a clear window looking into my computer so I can see the motherboard and cards. I just looked over at my GTX 1070 card and seen it displaying "FAN STOP" in lights light on it.
I loaded on an graphics card overclocker tool and have got the fan running on it again. Temperature is down to 34 degrees Celsius and the light is off again. (Note nothing is overclocked on this system)
Not sure how long it was like that. Although I notice both my F@H slots on this computer are now reporting failed.
I have changed the resolution going to my monitor to 1920x1080 as it was in 4K Resolution (I got a 32 inch Samsung 4K monitor a few weeks ago) and hope that helps as I can't afford a new video card right now.
Now I need to figure how to get the folding going again on this machine.
Just wanted to chime in here since I have the same GPU as you. The Fan Stop light you are seeing on the 1070 is actually a feature of newer GPUs. What they do is turn off the fan when the GPU is below a set temperature. Most cards set this at either 50C or 60C. The purpose of this is to make the GPU completely silent when you are doing things like browsing the web, doing office work, or watching a video on YouTube. The light is just there to let you know when the GPU is operating in that mode. The fan will kick back on if you are gaming or folding.
I'm pointing this out because the Fan Stop light you are seeing is related to the issue you are having but it's not the cause of the issue so turning the fans back on with overclocking software won't solve anything. The fans just aren't spinning because the card isn't folding properly and that means it's not generating enough heat to kick the fans on.
It looks like you have already solved your problem with different drivers but I wanted to point this out for future reference.