Question My brand new PC keep crashing

[MeisterFN]

I recently just built my PC and whenever i go into a Fortnite round it shuts down, the keyboard colors freeze and the mouse turns off but the PSU stays on, i have stress tests on the GPU, CPU, and RAM and they are all looking pretty good. My Specs:
GPU - AMD Radeon RX 5700 XT,
CPU - AMD Ryzen 7 2700X
Motherboard - ASRock X370 Killer SLI/ac
PSU - EVGA 750W

 

[rgd1101]

fresh os install?
latest bios?
check cpu/gpu temp during the game?

 

[MeisterFN]

I haven't done that yet, but i will, nope, the latest BIOS doesn't support my CPU, i have version P5.40, both GPU/CPU temps are around 48 Celsius.