My sapphire r9 280x toxic is not detecting by my new mobo that is asus p8h61mle. When i putmy card in a mobo it shows no input sign but works with the integrated graphics. Is my card dead? Or else i have a bad psu? Bc sapphire says that you should have 750w to run it properly and i have cooler master 650watts.. I put another card in the mobo and its works fine. Please help me.