Question Asus TUF Gaming x870-PLUS WIFI lights up but will not power on

[biffjorgenson]

Hi all, links to the mobo and CPU I bought are below. I'm a fairly experienced PC builder, and I've done all the troubleshooting I know (unplugged all peripherals, graphics card, etc.), QLED for diag seems to work, when power goes to mobo RGB lighting turns on and actively undulates. QLED diag is functional, tested by removing RAM from DIMM. I made sure the power switch was wired to the header correctly, and despite power getting to the mobo it just won't power on.

I have a 3090 GPU, Ryzen 7-9000 CPU, and an 850w PSU. I ordered a new 1000w PSU in case this was the issue. I know the case/pwr buttons work as I'm simply replacing the mobo/CPU in previous ATX case.

I just got the mobo from Newegg today, but I hate to return it if I don't have to. Is there anything else I can to to troubleshoot? Thanks!

https://www.newegg.com/p/N82E16813119686?Item=N82E16813119686

https://www.newegg.com/amd-ryzen-7-...cessor/p/N82E16819113843?Item=N82E16819113843

 

[Lutfij]

Welcome to the forums, newcomer!

and an 850w PSU
850W is the advertised wattage of the unit. What is the make and model of the unit?
I know the case/pwr buttons work as I'm simply replacing the mobo/CPU in previous ATX case.
Assuming the PSU is also being recycled, how old is the unit?

I ordered a new 1000w PSU in case this was the issue.
Make and model of said unit would help us two fold.

Have you tried building your innards breadboarded? Rams on slots A2 and B2? How are you cooling the processor? Did you inspect the CPU's socket for any bent or broken pins? Try and relieve some pressure from the CPU's socket off of the cooler.

I have a 3090 GPU
Your processor has an iGPU, try working without the discrete GPU.