After two weeks of messing about with internal hardware and BIOS settings, sending bits n pieces of my PC all over the country to be checked by some really nice guy who works for Sapphire, they've finally decided that my Motherboard is at fault.
So I have to send the whole PC back.
HAH!

This is kind of annoying as I hoped there would be a simple solution I could pass onto others with the same problem as me.

Best thing I can recommend to anyone else who's done everything I did and installation of a PCI still soundcard didn't work...
Complain in a really polite but persistent way to the people who make the soundcard, the people who make your motherboard and whoever sold you the PC.
Someone somewhere will help!