Hi - Many thanks for the responses.
I've managed to successfully repair the power supply myself - I went for the external power-adapter method.
It now powers-up and works!!!
Unfortunately since the repair I've discovered the Sub-woofer is no-longer working too good.
It comes to life at high volume, but with a buzzing sound - I guess this means its damaged and I'll need to replace it also.
Does anyone know where I can find a replacement sub-woofer? I'm based in the UK.