On/off failure to post

Izyalin · June 11, 2020

Hello all, I hope that you can help me with my new PC build. When I press the power button, the system seems to start (fans on CPU cooler, PSU and, and case start spinning), but after a few seconds (maybe 5-10) the system stops (fans stop spinning) and begins again. I believe we would call this failure to post. My motherboard does not have an indicator LED for post codes, and I don't have a PC speaker to get post codes that way either. Using the HDMI output on the motherboard, my monitor never gets any signal.

To troubleshoot, I have removed my graphics card so that only CPU, PSU, Motherboard, and RAM remain (pictured). I have unplugged and replugged firmly the 24 pin and CPU power connectors, and reseated CPU and RAM (trying all slots with a single stick). I have tried clearing the CMOS, though the process was slightly unclear to me, so I could elaborate in a response.

I have built a PC successfully before, but unfortunately I do not have it with me to try to test each component individually, and only a laptop besides. The PSU, CPU, and Graphics card are new, but the Motherboard was pre-owned, purchased from eBay. The listing mentions that it should be compatible with 3000-series CPUs, but the provided manual only mentions the Summit Ridge Architecture. Additionally, when I was installing the CPU cooler, the stock Wraith Stealth which comes with the CPU, I feel like I might have overtightened it. Therefore, I suspect that the motherboard might be the cause of the problem. If so, do you think I am out of luck as far as warranties and returns go? Also, what would be an acceptable replacement? I don't need anything fancy.

ASRock AB350M Pro4

Ryzen 3 3200G (with stock cooler)

Sapphire RX 580

OLOy DDR4 3000MHz 2x8GB

Corsair CV650 Non-Modular PSU

Samsung 512GB SSD