Let's here more about that PSU (make, model or a picture of the specification label.)
May as well share a Web Speccy too.
To preface, this has happened twice in 3 months with a different motherboard and RMA'd card.
In december my computer froze and my graphics card got error 43. I tried everything under the sun to get it to work but nothing did, so I RMA'd the card. Around the same time my audio jack stopped working (both front and back). I know how to set default device and what not, and reinstalled drivers, did the uninstall driver in device manager trick and nothing worked, just static sounds in headset. I bought a new mobo and the audio works.
Fast forward to yesterday, I'm having the exact same issue. My RMA'd card which worked for two months just got error 43, and after a bit of trying to fix that, my audio jack on my NEW mobo stopped working. I'm at a loss, could it be a grounding issue or my PSU going bad?