Gpu working but no giving signal on my motherboard.

Hello guys i have an asus maximus v gene z77 and an r9 290x,the cpu,gpu and ram were tested on other motherboards and it works the problem comes when i plug the gpu to the asus motherboard,(it works with integrated cpu graphics but with some withe on screen points) as i said when i plug the gpu and turn it on it goes crazy and shows a lot of code errors that changes every time. Hope someone can help me or says me if is any way to repair it.Regards.Pd:sorry if my english is a bit trashy.