Hello, I'm currently building my first computer. I've put in the cpu/cooler, RAM, video card, and power supply. I've connect the front panel stuff. Then before I got to far, i decided to turn it on. So I plugged it in, and pushed power. Nothing. I made sure to plug in the 24pin, 4pin, and the pcie. I also plugged in the front panel power connectors. Now what could be wrong, why won't it turn on. Is there something I am missing.