This is the oddest problem I've experienced from my years of building computers as a hobby. Out of nowhere my audio output got extremely low as in barely audible with the volume turned up all the way. I've been running this PC for years without issue. I thought perhaps it may have been the speakers so I tried a different set...same thing. I tried headphones...same thing. I run both Linux and Windows and get the same thing on both. I've been using onboard audio so I thought I'd try a PCI sound card...same thing! Can anyone make sense of this??