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Motherboard Audio Malfunctions

HP Recommended
HP Compaq 8300 Elite SFF
Microsoft Windows 10 (64-bit)

Hello! I have an audio issue with my PC that I had recently replaced a motherboard with. I tried explaining this issue before, but to no avail on here and a couple other sites. Basically my computer only detects one output speaker at a time, even when there is two plugged in. This seems to only be an output problem as my mic seems to be okay. My Computer will detect and use the last speaker device plugged into it. When I am playing sound on my plugged in rear speakers and I plug my headphones in, the sound switches to the headphones, but I can't switch audio devices as the computer only detects one. There should supposedly be 3 speaker options, my onboard case speakers, (which only work and detect if no external audio device is plugged in the computer) my rear speakers (surround speakers plugged into the back), and my headphones (plugged into the front). I've tried updating drives and reinstalling them which seemed to do nothing. Before this motherboard swap, I had a compaq 6005 pro which allowed me to switch between audio outputs and detect all devices plugged in the computer. The swap was a direct bolt-in with everything plugged in. This got me thinking, could this be a motherboard issue? Could the sound chip be dysfunctional? If I buy another motherboard, the exact same model and swap it in, would it resolve the issue? Or maybe it was the different motherboard swap, in which I highly doubt. Help?

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