I bought an open box Asus Sabertooth R2.0 for my first build, and I put a brand new FX 8320 in it, but every time I boot up, the CPU LED is on but not blinking and I get no display. All the fans power up, and I also tested an FX 4300 and the same thing happened. What could the problem be? Also, I have 1 4gb stick of G-Skill Ripjaws running at 1600Mhz.