ROG 850-i not booting

[Da_platypus]

I am building my first ITX. After updating bios, and POST the yellow DRAM is constantly on, and I have no display on my monitors from the computer.

I am using a  ROG  Strix 850-I motherboard,  7800X3d processor, 2x 16gb sticks  of DDR5 ram, 850 watt power supply, and a 7800xt graphics card. I have taken all components to a PC repair store, and verified that they all are functioning correctly. I have also swapped every component for the exact same component, as well as tried different GPUs, rams sticks, monitors, display cables, HDMI cables,  and individual wires between components inside the case, days of checking different possibilities, but my problem continues.

-I have left the computer on for hours to perform RAM training

- I have tried one stick at a time, with different sticks

- I have tried CMOS flashing, and BIOS flash multiple times after trying different fixes.

Please help

[MrAgapiGC]

yellow light and white light? or only yellow? 

let check one at the time. since yolu have to post  before doing anything else. I will asume you flash it to 1078

use 1 stick and let check. YOU CAN also remove the gpu and use the internal igpu for the test. 

If the store check each component and all comes ok then there is no reson to post.  CABLES monitor psu IS IRRELEVANT

i will be home in 8h 

[Da_platypus]

-only yellow, 

-white does come on when GPU is removed, yellow is on either way.

- I have tried 4 different sticks, one at a time, and two at a time, aswell as tried to do bios, and memory training.

- I understand that not everything I have tried is a usual fix, ie. The wires, but I was trying to show the extensive trouble shooting I've tried on my own before seeking more help.

[MrAgapiGC]

If 1 stick with nothing aside cooling, cmos reset , and still yellow light, is the cpu or board. then the parts where not test properly. GO to a local shop and test those 2, cpu first. If you reflash properly and still yellow light is present board or cpu!

[Da_platypus]

Thank you everyone that gave input. Ultimately I took it back to the repair store, and had them make it work, and install the operating system. It works now, I have no idea why, or how. I live in Japan, so I couldn't exactly get a detailed breakdown of what the problem was, or how they fixed it.