Recently, and for no reason I can fathom out my speakers have stopped working with a Windows 10 PC. They were connected via standard 3.5mm jack and had been working fine for years. I've tried connecting headphones to the same 3.5mm port - no joy. Nor the one on the front of the case. I've tested both headphones and speakers elsewhere - they're working. I can get sound either through my monitor (which has built in speakers) or connecting bluetooth headphones via a BT adapter. I do seem to have two Digital Audio (S/PDIF} devices that appear identical in Playback Devices. When playing content only one appears to have anything coming through on the mixer. I don't have any audio management software, just Windows. And I've tried disabling everything in playback devices - no change. I didn't make any changes (knowingly) to cause it to stop working. Any ideas what's going on - hardware or software?