Aurora R3, not recognizing a 4th internal hard drive

hello! just wanted to see if anyone has encountered this before, or possibly knows how to fix it. the R3 has 4 3-1/2" internal bays, which are supposed to have a max capacity of 2tb per drive. the problem that i'm having is (even though I've rearranged drives many times to check for a faulty HDD, and that has never turned out to be the case), for whatever reason, windows simply does not recognize that I have a hard drive connected into my 4th bay, no matter whether it's 2tb or less. the bios recognizes it, and displays it on the boot screen, but windows simply doesn't show it at all. I have read many posts and articles suggesting that I try the disk management utility to add it to the list of recognized drives and/or assign it a different drive number than the rest. it doesn't even show up at all in the disk management utility to allow me to add it, or even change the drive number. as i'd said before, I've switched around every drive that I have just to make sure that I don't have a faulty drive. everything works perfectly, just not in bay 4. I wouldn't think that it would be faulty cables since the bios recognizes it. I've simply run into a brick wall. I have an R3, A06 bios, and running windows 10. any help or suggestions that anyone could give me would be much appreciated! thank you all SO much in advance!!!!