Tessa said:
Thanks for all your adivce, cheap at 1/2 the price! The wires are sealed units and it all sounds too complicated for me so I'll call in an expert - would this be an electrician or a computer boff?
GRC - Don't be annoyed with me, but I think you give up WAY too easily. It's not difficult or complicated.
You could get some white sleeving to cover over the black wires; Maplin or similar electronic suppliers can supply this. However, you'd need to disconnect either the plug at the computer end, or the cable at the speaker end, to get the sleeve over the current cable (and its extension).
As someone pointed out, a simple extension lead would do the trick, but wouldn't get around the colour match failure.
The leads may be sealed into the speakers (i.e captive leads) but there's no reason you can't take the speakers apart to disconnect them and splice in some extension cable in white. Where there's a will there's a way.
Regards, Graham