After a few seconds the vol bar came back up with same symptom which is keep sliding all the way down to 0%. I plugged it back in to the same USB port. The stuck up volume bar disappeared right away. I removed the keyboard off the USB from the running system. It may be as complex as changing the variable resistor (if not something else) or may be as simple as dirt accumulation (yes, it is a old keyboard), or even be a stuck piece of paper or a broken staple from my table. Plan B: To take apart the keyboard and find any hardware issue, that is causing the volume control to be shorted on either up or down point.
Plan A: To disconnect it from that USB port so it can clear out any soft error with that particular port, and then to reconnect to another USB port. So the source of my problem boiled down to the keyboard, either a hardware (as in a short circuit either to the highest point of vol or lowest), or a firmware (I do not know exactly how this keyboard operates but I assumed this kind of short is possible to be created by the soft error as well as hardware). Instead of "vol bar get stuck on screen" I started to think "vol bar staying activated", which raised the question, "why?" I imagined the answer would be, either the keyboard volume knob is continuing to send a up or down signal to the PC and PC is responding by raising or lowering the volume all the way up or down, and since the keyboard is continuing to send the signal, the on screen bar is remaining activated. Well, last week I noticed for the first time that instead of going all the way up, it is going all the way down to 0% and volume bar staying on the screen. I even did a system restored but the problem came back.
I tried many things, tweaked many settings, even uninstalled sound card driver, keyboard driver everything and then re-installed. So every time I rotate the volume knob on the keyboard, the on screen volume bar would operate properly (up or down) but as soon as I let the knob go, the bar would go all the way back up to 100% and stayed there. I use Microsoft SideWinder X6 Multimedia Keyboard. On my Windows 10 System I was getting the volume bar just like the picture posted by DavidHK129 automatically keep going all the way up to 100% and then stuck on the screen.
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