New PC turns on, fans start spinning increasingly faster & PC shuts down about 20s later

[DilkenBee]

Hello guys,
I just finished building my new PC and I can`t get it to work properly. When I turn on the PSU and then press the power button the PC turns on, the RGB comes to life, the fans start spinning slowly. Some of the motherboard´s EZ debug LEDS turn on: The red CPU led turns on first for about 7 seconds, then the DRAM led is skipped and the white VGA led turns on for about 5 seconds and in some cases the green boot LED also turns on (They sort of cycle through chronologically and only one LED is lit at a time but the DRAM one is skipped). During this time the fans start to spin increasingly faster until, about 20 seconds later, I hear a click and the entire PC turns off. Of course I never got a display signal.

First of all here are the specs of my PC build:
Specs:
CPU: AMD Ryzen 5900x
GPU: Nvidia RTX 3080 LHR
Motherboard: MSI MPG X570s Edge Max WiFi
RAM: Corsair Vengeance RGB PRO SL 2x16GB
PSU: Corsair RM850x (2021)
SSD: Samsung 970 Evo Plus M.2 NVME SSD
CPU cooler: Corsair iCUE H150i ELITE CAPELLIX 360mm AIO with 3x 120mm fans
Other fans: 4x Corsair LL120 2x Corsair 120mm
Case: Corsair 5000d Airflow

Things I already did:
-I made sure all the cables were connected correctly
-I reset the CMOS with the board´s dedicated CMOS button and by physically removing the battery: Nothing changed
-I updated the BIOS: Nothing changed
-I re-positioned my RAM sticks checking all RAM slots in single channel & dual channel configurations. I also tested all RAM slots with a single RAM stick: Nothing changed
-I swapped the SSD with another M.2 NVME SSD: Nothing changed
-I put the GPU in a different PCIE slot and even removed it entirely to see if the PC would at least not shut down immediately, knowing that I wouldn`t get a display signal anyway: Again nothing changed
-I tried using different ATX, PCIE & Sata cables (Leftover cables from the PSU): Nothing changed

The only possibilities left are: Damaged CPU, broken motherboard or malfunctioning PSU (Although the fans & lighting turn on, the voltage may vary)
I can`t imagine having broken any of the parts myself, since I grounded myself and handled all of the components with more care than you anyone could imagine. I also made sure not to touch any sensitive areas of the components.

Since I don`t have any parts to test the rest of my PC´s components nor do I have the budget to acquire further ones or friends that could lend me their components, I´m truly frustrated.
I hope somebody on this forum can help me. I would be eternally grateful!

Thank you very much in advance!

[veeg]

Hello
I suggest that you cardboard your pc parts.. Get some cardboard disassemble pc parts place on carboard and then reassemble parts and power up.. If it does not perform correctly it is probably a hardware issue. If the system powers up correctly,then this comes down the install.. Make sure your standoffs are seated correctly and the mobo is not touching the case.

[Rustys]

How much thermal paste did you use?

Some motherboards require that the CPU fan is plugged into the motherboard.

Did you use the proper risers for the motherboard?

[DilkenBee]

Ok, so I installed the CPU cooler now and as a result the PC doesn[ICODE]t turn off immediately after 30s. So problem 1 is solved . Although the PC remains on I don[/ICODE]t receive a display signal on my monitor.
I checked all of the connections, the monitor, the HDMI cable and plugged the HDMI cable into my GPU since I´m using a Ryzen 5900x.
Do you know what could be causing this issue? It`s driving me nuts

[DilkenBee]

BTW I also checked and my motherboard is definitely seated correctly and all of the cables are most certainly plugged in correctly.
Yet I still don`t get a display signal and the green EZ debug LED labelled boot remains on even 20min after turning on the PC…

[Bruce]

Ok, so I installed the CPU cooler now and as a result the PC doesn’t turn off immediately after 30s.

does that mean you were using the PC without the cooler initially?
have you tried the cardboard suggestion yet?
are you sure the graphics card and memory are compatible with the mobo?

[Rustys]

Do you have a different display card to test with?

CPU: AMD Ryzen 5900x

Which one showing that there are two listed and each require a different BIOS.
[ATTACH type=“full”]8922[/ATTACH]

[Rustys]

Closing thread following instruction on other forums