Hi guys. I have a system build by me a while ago. It's a i9 9900, Gyga z390 WIFI Pro MB, 32GB RAM Corsair Dominion 3200, GPU Nvidia 3070 Ti FE. The issue i have is that every time I start the game I usually play (WoT), as well as other games like RDR, games starts, I can play for 30-40 seconds and suddenly the computer crashes remaining in a state where i have my light on on the MB and everything else is shut. To restart i need to shut my PSU after which I can restart it. Now, initially I believed is the GPU, which I changed it with my son's but the problem persist with the difference that i can play maybe a minute or two more. So, I have a feeling is the MB but I am not sure really and before I buy a new one I would like to know if any tests are available to be sure. I have no errors, no strange behaviours other than the ones I described. As well if I do not play anything computer is working fine. Any help is appreciated!!