I have had a 2070 for around a year now and have not run into any issues until I started to play Dark Souls 3 and noticed awful frame drops, when used task managers RM to see if I could diagnose my problem from there I noticed my GPU temp had gone to 88C. I then looked in my case and noticed my fans were not running at all.

Here are some of the steps I took after this to try and find out what is going on.
 

• Downloaded Precision X1 to force my fan speed and even setting it to manual setting yields no results
• Unplugged my PCI-E power Cable and plugged it back in: nothing
• Switched my PCI-E power Cable with another: nothing
• Took my GPU out entirely and cleaned it of what little dust there was: nothing

 
I have run up against a wall here and don't want to potentially damage my GPU, as if it has gotten that hot before I have not noticed it.
 
My current build is as follows:

• Motherboard: ASRock X570 Pro4
• CPU: AMD Ryzen 3600
• GPU: EVGA GeForce RTX 2700
• PSU: Corsair TX 650W
• Hard Drive: Samsung 1TB SSD
• RAM: 2x G.Skill 16GB DDR4

As an Addendum that may or may not be relevant my case is a very old E-Machines case that I KNOW does not have that great of air flow, but I have modified it take larger, better fans when I made this build.

It is still under a 3 year standard limited warranty according to EVGA's warranty page, with the suffix KR being present on my card.
It is an RTX 2070 Black
I am not sure what the limitations of the software are, but the fans will not spin at all, regardless of the what % they are set to. I believe that they should also spin a little when turning the computer on, but they have not been observed to do that.
Yes the fans are able to turn freely and make a full rotation with not problem.

you could try turning off fast boot in BIOS, make the MB look at all the hardware... its a loooong shot, but an easy test
 
Any errors in Device Manager ?
 
I was asking which card because some have a second BIOS position & you could throw the switch & boot on the 2nd BIOS
 
If the card was working properly & you were not loading firmware or a new BIOS on the card .......
 
If your not sure about using X1 software, you could try Afterburner & see what is being reported about the card with GPU-Z look under sensor tab
 
unfortunately it seems to be a warranty issue .. possibly the fan controller? ... because neither fan will work