Hey there, @NUBETOOBER39!
If you manage to get the HDD recognized anywhere in the system, I'd strongly recommend you run your
HDD manufacturer's brand-specific diagnostic utility and determine the health and SMART status of your secondary drive. If swapping the SATA cables and the SATA ports didn't help the system detect the HDD properly, then I'd recommend you plug it in another working PC and see how it would get recognized there. Make sure you backup all your data from the drive as soon as you can access it.
Another thing you could try is connecting the HDD externally via a docking station/enclosure
(with an AC adapter because 3.5" HDDs need additional power supply),
If none of these work and the diagnostic tests fail. I'm afraid you will need to turn to a professional data recovery company for help with the retrieving of your files.
Keep me posted with the troubleshooting, though!
SuperSoph_WD