My husband and I assembled a brand-new PC using an ASUS B650E MAX GAMING WIFI AM5 motherboard, Ryzen 7 7800X3D, RAM, graphics card, fans, and a power supply. The fans spin and the RGB lighting turns on, but the system never POSTs and there is no display output. I successfully updated the BIOS with the correct BIOS FlashBack file, cleared CMOS, tested both memory sticks individually in the A2 slot, reseated the RAM and GPU, tried another power supply, tested several monitors and cables, and attempted to use the motherboard HDMI output with the GPU removed. The 7800X3D has integrated graphics, but nothing appears on-screen. Could this be a motherboard, CPU, or socket problem, or is there something specific I should check with this motherboard and processor combination?
3 Answers
A single stick in A2 is the right configuration for testing. Since you have already tried both sticks separately, confirmed the power and GPU connections, updated the BIOS, and tested integrated graphics, the next useful checks are the diagnostic LEDs, CPU power connectors, cooler connection, and the CPU socket itself. If those all look correct and memory training never completes, the motherboard or CPU may be defective.
Check the motherboard’s diagnostic LEDs to see whether it is stopping at CPU, memory, or another stage. Also verify that both CPU/EPS power connectors at the top-left of the board are plugged in, along with the fully seated 24-pin motherboard cable. Make sure every RAM stick is completely locked into place, the CPU cooler is connected to the CPU_FAN header, and the processor socket has no bent or damaged pins.
AM5 systems can take a surprisingly long time on the first boot while they train the memory. After clearing CMOS or changing RAM, leave the system running for several minutes instead of shutting it down quickly. The debug LED that remains lit should help identify whether it is still training or failing at a specific component.
I used one stick in A2 and tested both modules individually. The GPU and its power cable are connected correctly, and I also tried booting without the GPU through the motherboard HDMI output. BIOS FlashBack completed successfully with the correct file, but the system still powers on without showing anything.