Check ebay; gateway rarely carries a replacement board for more than 18-24 months. What is your system model number and what is the manufacturer's date?
I have bought a Asus mobo, it has some problems with the wiring of the audio to the new mobo, but even if I have to install external speakers everything else is working fine, I don't want to be enslaved by the Gateway mobo again. But o1die thanks a lot. By the way I did find out that www.skyline-eng.com sells Gateway mobos, but they did not have my model