I recently purchased a power supply and installed it in my 6-year old PC with an Intel i-7 6700k CPU. It doesn't work. No light, no fans, no sign of anything. I assume the power supply is simply broken, but before I RMA it, I need to ask if something changed in the past 6 years (since I last built a PC) that would cause new power supplies like the one I purchased to not work with older system boards (from 2016). Is there some kind of incompatibility issue? Or should I just return it?