So I have been having crashing problems on a PC I built recently. Often when I am playing games, my PC reboots/crashes and I get a "no signal to monitor" on my screen. I tested my RAM and am going to test my CPU and GPU next. Before I did that, however, I noticed that my MOBO has a 24-pin connector obv for the power. The PSU cable was 20 pin and a separate, but connected 4 pin connector. I NEVER CONNECTED THE 4 PIN, just the 20. Is it possible that this is the issue? I have been getting somewhat low 12v readings around 11.55-11.7.