asus rampage extreme

Hi everyone. The motherboard won´t start properly. The POST code goes from 00 to 14 to 76 and it stays there. Also, the CPU LED stays on solid, the PCIe 1 LED does not light up, LED´s 2 and 3 stay on solid and the PCIe 4 LED blinks constantly. According to the manual, the 76 POST error is due...