A prologue - I could not find a category for hardware-based sound questions, so I apologize if this is the wrong place.
I just built my first computer, but I cannot get it to send sound at all. I also opened up the case to make sure nothing was disconnected.
Right now I have my front speaker (the standard green panel) connected to my speaker system (I tested to make sure it worked on another computer).
Under Sound -> Playback Devices, I see listed Speakers, SPDIF Interface (TX0), and SPDIF Interface (TX1).
I have "Speakers" selected as the default device. However, I cannot get Windows to send anything out. If I am playing something with sound, I get no green bars, whether or not something is plugged in. If I try to test the speakers, it says "Failed to play test tone".
A note - my sound did originally work on the fresh install of Windows. I applied windows updates and updated my video card drivers, and then it stopped working.
Actually at that point I was using the speakers on my monitor (DVI for video, standard speaker audio cable for sound). After the update I started using HDMI and I never got that to work. And Windows would not detect the monitor speakers after that, even with the DVI/speaker setup from before. However, I suspect all that cable nonsense is a red herring.
I suspect my problem might be Windows-related. Searches have found that others with this problem had their sound broken by a Windows update. But the only updates I have installed are kb971003 and kb2621440. I could restore back to a previous point (which is practically to the fresh install point), and then work around not installing those particular updates. Is that worth trying? Anything else?