I have 2 plugs on the headphones and three possible sockets to plug them into
I believe that one of the plugs is for the built in mike in the headset
I have discovered that the centre socket is the line out and although I have tried every possible permutation of plug / socket I still can't get any sound
Yes they are colour coded
Whoops should have looked
Yes I do have a manual but 'er indoors has been doing her monthly spring clean and I only just managed to find the computer !
Tis a Dell Dimension 2400
Have managed to download illustration of rear of computer and the centre socket is clearly marked as line out
Now if I can only find my other earphones I can see if they work
Put the black jack plug in the green socket. Click "start", then "control Panel", "sounds & audio devices", under "volume" "advanced". Make sure nothing is ticked "mute". Back to "volume", check "mute" box is not ticked & it`s handy to tick "place volume control in taskbar". Hope this helps.