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Question Computer Will not boot, Red CPU and Yellow DRAM light

Jul 10, 2021
Motherboard: ASUS ROG STRIX B550-A
CPU: AMD Ryzen 7 5800X 3.8 GHz
RAM: CORSAIR Vengeance 32GB DDR4 3600
CPU Cooler: Corsair iCUE H150i
Power: CORSAIR CX750F 750W
GPU: Gigabyte GeForce RTX 2060 OC 6G
SSD: Samsung 870QVO

I am just building this computer have not successfully turned on yet. DRAM yellow light for 5 ish seconds goes off followed by red CPU light for one second which goes off followed by white YGA and green BOOT which both stay on. Keyboard and mouse light up and all RGB internally stay on. Monitor doesn’t recognize power.
Have tried
New cooler
Changing modular power supply cables for CPU
Using 8 and 12 pin.
Rotating out RAM sticks in singles and together
Probably something else I’m not thinking of.


This motherboard (User Manual)?


(Verify that I found the correct User Manual.)

First, check that all of your selected components are indeed supported. Most likely you will need to go to ASUS's website for more updated information. Pay attention to all fine print, warnings, etc..

Reference the motherboard manual to double check all connections and configuration settings. For example, some motherboards require that the first installed RAM module be placed in a specific slot.

Likewise double check the applicable User Guide/Manual for other installed components.

Check by sight and feel that all cards, connectors, RAM, and jumpers are fully and firmly in place. No one wants to force a connection on a new build so what feels "tight" may not be tight. Try gently unplugging and re-plugging connections, etc. to rock them fully into place. May take a few tries to fully seat into place.


"Changing modular power supply cables for CPU
Using 8 and 12 pin."

Do not install/use cables from other PSUs.

Hopefully the problem is only some error of omission or commission.
Jul 10, 2021
Yes! I’ve found as well that if I move the GPU to the second PCIE slot the white light will go away after starting (still no picture using HDMI from GPU and Mobo)
Aug 12, 2021
I guess this was already fixed, but if not i had the same problem with this same motherboard last November, the problem is that bios on the motherboard is old and does not recognize the new 5000 ryzen procesors, the easy fix to it is flash the new bios on your motherboard that you can do without pc running thanks to dedicated bios flash usb port.