I have actually run into this same issue with this card. I would like to say I have a quick fix but don't
It is possible your port went bad.
In my case I just used the other port too. Then about 6 months later I reloaded Windows fresh and it worked again.
If you have a spare drive and can test a fresh install of Windows to i then you could try that.
A good indicator though if it is the port or just Windows corruption is can you see anything on the port when booting like the bios information or boot logon. If you can and then the port just goes out when loading Windows it is probably just a corruption in Windows.