Why would the fan be running at 100% in bios, what have you done in bios settings to cause that.
Maybe you should post your query on the asus support forum for instructions on how to set up bios correctly ?
Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T..