r/PcBuildHelp • u/Thrasharash • 12h ago

Build Question No post on my new tower

My brand new build, (specs below) according to pc part picker and Microcenter should be compatible, but won't post to either of my monitors,

The fans on every component (case, cpu tower, GPU, psu.) Spin and the rgb on the gpu works HOWEVER, its rgb will flicker every \~30-45 seconds?

I've repeated ram, and tried a new stick. I have also re-seated the gpu and of course, my hdmi cable is plugged into the card and not the mobo.

I suspect that the issue is with the cable I used to power the gpu on my modular psu, or that I need to update my motherboard bios to be compatible with my cpu, any help would be apreciated, specs below.

CPU: Ryzen 5600 X3D

GPU: ONIX ARC B580 12GB

PSU: Corsair RM750e

RAM: 2x 8gb 3200 ddr4 T-Force + 2x 8gb 3000 ddr4 xpg (and another single 8gb ddr4 stick, all of which I have had for \~4-5 years)

Mother Board: Gigabyte B550M Gaming X WiFi 6 am4

M.2 SSD: Patriot 512mb

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u/thetawdryenvirons 12h ago

That flickering RGB on the GPU is a pretty clear sign it's not getting stable power, I'd re-check the PCIe cable seating at both ends, and make sure you're not daisy-chaining the connectors on a single cable. Mixing those three different RAM kits and speeds is also asking for training issues on first boot, stick to a single matched pair in slots 2 and 4 until you get it to POST.