Creative Labs MegaWorks 250D 2.1 Power Supply

I'll try and describe this best I can, on the UK power lead on the end that plugs into the sub there is space for 3 pins, but there is only 2 pins which are in the socket of the sub.
On the adaptor designed for use on the continent there is the usual 2 pin mains plug, however at the other end where it is to be plugged into the sub, there is only space for 2 pins and not the third empty pin slot at the top, like there is on the UK power lead.
My speakers turn on, and a slight hiss can be heard from the speakers, however they will not output any sound, what should I do about this?
(Also I'm using a CL Audigy Soundcard, there is nothing wrong with this as I've trialed it using my older set of speakers. It is also one of the series' of cards these speakers support.
Any advice would be appreciated.
Dave

Anyone got any ideas?

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