The board could be bad, I've had poor experience with Gigabyte, but let's try something first.
I'd like you to do a Secure Erase
of the SSD which will require you to do a new clean install. This will give some info on how to do it. How to securely erase an SSD drive | How To - CNET
You will need to download Parted
Magic and I recommend burning the iso image to a CD, it works better. On the left side of the page is the Download link, it's a big one. Hopefully you can do this from another working PC.
When you reinstall Windows have only the SSD connected to your board.