GPU fans run at 100% but software says fans are at 0RPM?

Hey just wondered if anyone has encountered this before. I have an ASUS Strix GTX 1080 and it seems my fans have failed. The fans will soon up to 100 as soon as I log in and I cannot get them to do anything else. Have tried new PCIe slot as well as reseating the card and testing a different card. Unable to test in a different pc but was curious if you guys had any thoughts?