These speakers were plugged into my computer when it had a large surge come in through the internet plug. The computer survived just fine, but the speakers did not.
there is a knob on the front of the one speaker that is used to turn them on and off, and adjust the volume. The little green light on that speaker still lights up when you turn it on, but no sound will come out of the speakers even if I turn both the PC and speaker volume all the way up. It also does not make the pop sound that it used to when you turn it on. I checked the sound in cable and it is just fine.
I am sure that the surge came in from the sound in cord not the power cord. I have taken it apart and there is nothing visually wrong with any thing in there. I will take some pictures of the inside and post them in a few minutes.