My son and I built a PC last night and it is not working. When powered on, the fans go on but the monitor says there is no signal. We tried plugging it in HDMI and the other way (sorry, forgot). Anyway, I opened it up, made sure everything was plugged in right and tried it a few more times. There are a couple of power cords from the supply that aren't plugged in but I assume they are for other devices we didnt buy. There is one 8 pin that says CPU on it but there is no place on the motherboard that I could find plus we used the bigger power cord that has 20 or more pins to plug into the MB. I know its hard to trouble shoot something without seeing it but where would you start to look for a problem. How would I even know if its the MB or the CPU or a power issue. I am assuming that once I turn it on I should see something that lets me then change the boot up to my windows USB install. I even tried leaving the windows USB in when I turned it on and that didn't help.