Hello Shurrekin
Welcome to the ROG forum !
Your psu is not quite enough, the gtx 970 calls for a minimum of a 500w power supply. The fact you are not getting a q code is not a good sign and this can be one of two things, the psu or the motherboard.
Running an under powered psu is not good thing, it can damage the psu as well as other components and let's hope only the psu was affected.
The first thing to try would be a higher wattage psu. Even though the gtx 970 calls for a minimum of a 500w psu it's good to give it some headroom. A 600w would be good but If you're going to be overclocking a 700w - 750w would be better.
You need a higher wattage psu anyway so if you will be overclocking look at a 700w - 750w. Seasonic is a good quality brand, be sure to get at least a gold rated or higher. The more headroom you give your psu the cooler and quieter it will run and the longer it will last.
So get you a higher wattage psu and see if that gets you going, if it doesn't get you going then you will have to rma your motherboard.