I just built a new computer with an Asus M4A89GTD Pro mobo/Phenom II x6 cpu. Power supply is corsair 750w. 4gb corsair 1600mhz ddr3 memory. Now the problem is, I can't get the light on my mobo to turn on. It's not my power supply so I am thinking the mobo isn't working. I had the 24-pin and 4 pin connected... also switched to 8 pin and still didn't work. Any suggestions? All help appreciated.