We all do shit like this at some point right?
I remember once I was having a problem with a 192's output, and checked everything on the software side. So I decided to pull it apart and re-seat the card. If you have ever done that, you know they have 40 million screws on the top panel. So I take it apart, take the card out, slide the card back in and screw the top back on only to realize I didn't put the card in right, so I have to take all the screws back off and do it again. Then I realize the outputs still don't work.
Seems it was one of the output settings in the hardware menu, which I thought I had checked before. Cost me 2 hrs of time and about 50 new grey hairs