Here's the specs:
Processor: AMD 8350 Eight Core Processor 4.0 GHz
RAM: 2 sticks of 8 gigs (16 gigs installed)
GPU: NVIDIA GTX GeForce 2080 (Previously NVIDIA GTX GeForce 1050 ti)
Motherboard: ASUS M5A78L-M plus/USB 3.0
System Type: Windows 64-bit OS, x64-based processor
Power Supply: 750 Watts
(Main) Seagate 1TB Firecuda
Seagate 2 TB Barracuda
(2) Western Digital 2 TB Black 7200 RPM
I needed to replace my hard drives for my computer, so I switched out my 2 Seagate HDDs for 2 Western Digital HDDs.
After trying to boot up the computer, it got stuck on a DOS screen that said "Reboot and Select proper boot device or insert boot media in selected boot device and press a key." After some research, I assumed this was saying this because it needed an OS to run. So I put Windows 10 on a flash drive, turned the BIOS priority to be flash drive first, and still ran into the same screen.
At this point I've gone as far as to plug each drive in with my first one so I could format both of them. Even put windows 10 setup files ( the ones you get from the wizard on the Microsoft page) and still run into the same screen.