I put together my new gaming pc and it won't display or turn on keyboard. It powers up, the fans turn on and I even tested the USB ports to see if it would charge my phone which it does. The red cpu light is also on but nothings wrong with the cpu. I've checked all the connections and nothings wrong with my monitor. I've taken out the cmos battery and put it back and still no change. The only part that's not new is the motherboard. Do I need a new motherboard?