Gigabyte has a decent warranty.
1) Fill out this form: http://rma.gigabyte.us/DirectRMA/EndUser_Main.asp
It took me two days to get my RMA approved, then I shipped it in(At my cost). After they emailed me a shipping label/RMA number and some more info to fill out. Mine failed after 3 months, but I think it's a 2 or a 3 year warranty so you should be well within fine, minus the cost of shipping. It took about a week for them to get it, and they sent out an email saying they received it, and that's where I am right now. In all it seems like at least a two week process, so if you need a computer in the interum, buy a replacement board and sell the board GB sends you back, or return the temporary board depending on your own moral guidance.