The Pc is a Hewlett Packard "Professional" Compaq Model #: dx2200. The speakers are alive, but not producing sound. Looking at "my computer" I don't see that the speakers appear to be on it, and they don't appear on the Control Panel, either. They have been working, but my Broadband went down, and a technical support person from TalkTalk came in, and was "fiddling" around with the computer. I suspect that he knows something about their "disappearance!" But, I very much doubt that I shall get anywhere with TalkTalk in this regard. Currently, they are still plugged into the appropriate jacks in the rear of the computer.
Do hope you can give me some help, here.