computer keeps making badunk badunk notification sound for no apparent reason. WTF?

[footfootfoot]

Originally Posted by tw

Does not matter what is physically connected. What matters is more virtual. Visit Device Manager to learn what is really or really not connected.

According to device manager, unknown device is not connected.

I will have to retrace my footstepsI will have to retrace my footstepsI will have to retrace my footsteps to see what I might have connected or not.