z370 gaming 7

So, i just bought everything new from amazon: Intel i7 9700k, z370 gaming 7 , EVGA G3 750, a working HD, 970 EVO M.2 SSD, 2x 8GB gskill ram 3200 mhz and Corsair H45. The GPU is RTX 2080 but i took it out for the tests. With the GPU or without it the problem is the same. The problem is that when...