[SOLVED] RYZEN BUILD TURN IT SELF OFF - i need help :(

[TheN1Diaz]

Okay, so recently i put together a pc for a friend, and for some reason (which i cant find out) the pc just black screen everytime he starts playing. Temperature never has rise above 85 c for the cpu and 75 c for the GPU, already run stress test for cpu and ram (together) and it didnt crash as well for the GPU, install all the drivers for GPU and updaded the bios for the lastest version (1805 as for today for the rog b550). i dont have any component laying around for test, and im concerned because he trusted his money on me so i dont want. So far i think that most likely its either the psu, motherboard or ram.
Also everytime the pc turns off all the rgb stays on, im gonna ask a friend for a ram and psu for testing. But in the meantime i would be glad if someone can tell me if there is something i did wrong or if they had the same problems

Here the spec list.
Ryzen 7 3700x (with wraith prism stock cooler)
corsair vengaence 32 gb ram ddr4 3200 mhz
Rog b550 gaming f (non wifi)
rx 5500 xt 4gb gygabyte version
480 gb kingston ssd
2 tb barracuda hdd
750 w psu from cooler master

 

[NightHawkRMX]

Exact model of PSU?

 

[TheN1Diaz]

cooler master 750w, is this one https://www.amazon.com.mx/Cooler-Ma...ords=cooler+master+750w&qid=1614028456&sr=8-1

 

[TheJoker2020]

Also everytime the pc turns off all the rgb stays on

Most motherboards do this, there will be a BIOS/UEFI option to disable this.

I would try running FurMark, it has relatively low CPU/RAM usage and doesn't touch the internet or anything else in the system or software, but to be more certain, disable the network connections before running it. Time it from when you run it to see how long before it crashes (it most likely will crash).

If it crashes then it is almost certain to be the graphics card or the PSU, but the time taken to crash will be useful to know.

Be prepared to take your PSU and graphics card to your friends house (or his PC to yours) to swap the graphics card and/or power supply for testing, this is the ultimate way of testing what is at fault.

Good luck.