About a couple of weeks ago, I discovered that the audio on my PC wasn't working. My speakers have a volume knob and I keep them turned off 90% of the time so I don't know how long this has actually been a problem, but I actually discovered it a couple weeks ago when I tried to turn my speakers on and no sound played. First, I tried my speakers on another PC and they worked fine. I then tried another set of speakers on my PC and they did not work. My PC is custom built and the speakers are plugged into the Line Out jack on the back, which is where they have always been. I have attempted to uninstall all drivers from the device manager in the Sound, Video, and Game Controllers category. The same drivers get re-installed and the issue is not fixed. When I open the sound settings from the control panel, the Playback tab shows two enabled sound devices: Realtek Digital Output and Realtek Digital Output(Optical). I have tried setting both of these as the default device and no sound will play for either of them.
There is a "Speakers" device, which shows as not plugged in. Now, here is where it gets interesting. If I plug the speakers into the "Side", "Rear", or "C/Sub" jacks, then the "Speakers" device will show as plugged in. I can right-click the device and choose "Configure Speakers". If I choose one of the audio channels, (usually 7.1 surround), I can click on each individual speaker in the layout shown and one of them will make a sound. Which one makes the sound depends on which jack I connect it to, but it's always a speaker that I don't actually have (i.e. SR or RL). I have two speakers, so whenever I uncheck all of the optional speakers, leaving me with "L" and "R", neither of those two speakers work. I am really at a loss here. This seems like it is something that should be easy to fix, especially by uninstalling and re-installing the drivers. I am on Windows 10 Version 1803.
I should also mention that I uninstalled all drivers from the device manager and then installed the audio driver from the disk that came with my motherboard. It simply re-installed the Realtek driver and NVIDIA driver. As before, I have the same two Realtek devices to choose from and neither of them work. As far as the NVIDIA driver, that is for the HDMI ports, which I don't have speakers for. When I right-click the sound Icon in the bottom right corner of my screen and click Troubleshoot Sound Problems, this is what comes up (suggesting NVIDIA is for HDMI). It might also be worth mentioning that my PC is custom built. I built it in 2013 and installed Windows 8 on it. I upgraded to Windows 10 three years ago and haven't had any sound problems until now. I've done all the basic stuff and am really at a loss. Any ideas would be appreciated!