Yes it is the onbard sound card. the BIOS is all correct. I did think this too, but am now stuck once checked the BIOS and the drivers and compatability.
I have now reinstalled the drivers and had to connect headphones to the back I/O slot for them. and it seems to work but if i turn my computer off at the mains and then turn it on then the sound drivers have failed and i have to reinstall them at least twice berfore they work, with headphones or speakers plgged in.
For me this is a problem because it is a gaming computer and i move it around abit going to LAN's and mates homes and i don't always have speakers or headphones with me. So the whole tower is useless if it goes anywhere.
Thanks for your help though.