not to sound ****y but if your having troubles have numerous attempts, dont waste anymore of your time, I just spoke with AMD/ATI techs, and if your mobo bios are older than April of 2004 you will not get this to work if you bought this card for gaming. I was all sorts of issues and everything I threw at it, from this website, to others, to the support from ATI themselves, did not work, and it all boiled down to my mobo bios. I have VIA 82xx bios chips and all mobos I tried my Radeon 2600 in all gave me the same performance problems.
So my conclusion is, is that basically if you can not get this card to work, your best bet is to upgrade your mobo bios, and hopefully you will be able to get this to work proper.