|Is this something that has suddenly happened? Is it a new build? Can you try the speakers & headset in an mp3 player, phone or whatever, just to confirm that it is definitely a problem with the computer?|
First, make sure you have the speakers plugged into the correct socket - for normal stereo speakers it's usually the lime-green one on the rear. The front jack problem may simply be that the header isn't connected to the motherboard.
Do you get a pop-up of any sort when you plug in ore remove the speakers/headset?
As well as the standard Windows sound volume you may have more controls in Control Panel - look for something labelled Realtek, or anything else sound related - you may have it set to some weird 'ambience' option.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd