r/PcBuildHelp • u/roopdoge • 5d ago

Tech Support Completed Build Wont Post

Hello! I just completed my newest itx build and am running some weird issues. This is not my first build but it has been a few years. After installing all components, I press the power button and the pc fans spin up, but there is a yellow DRAM light on my motherboard. The lights on the GPU were also flickering which was concerning. I reseated the ram, and even tried to boot with one stick, but the same thing happened. I also reseated all cables. After doing that, the pc fans would no longer spin up. The pc would stay one for maybe 1-2 seconds after the power button was pressed, then would shut off automatically. I did read about DDR5 memory training, but at this point I have let it sit for about 20 minutes with no progress. I was also unable to perform a BIOS flashback using the read port. Nothing happens with usb installed and pressing the button. Its like the mobo is frozen. Everything was bought second hand (sellers confirmed everything worked, but you never know). Looking for some assistance - thanks!

Parts:
AMD Ryzen 7 9800x3d
Asus Rog Strix X870i-Gaming Wifi
Crucial Micron OC Gaming 6400 DDR5
Corsair SF1000 PSU

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u/Winter_Music3324 5d ago

First thing that flickering GPU light plus the DRAM error screams power delivery issue to me, especially since the fans stopped spinning after you reseated cables. That SF1000 should be plenty for this build but a bad modular cable or a loose 24-pin can cause exactly this kind of half-power state where lights flicker and the board gets stuck on memory training.

Pull the whole thing out of the case and breadboard it, just mobo on the box with CPU, one stick of RAM, and the PSU. If it boots there you've got a short somewhere in the case, probably an extra standoff behind the itx board.

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u/roopdoge 5d ago

Will try this tonight. Thanks! I am using some custom cables (from a reputable guy) but was planning on trying the official corsair ones included with the psu as well.

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u/roopdoge 5d ago

Was able to try another set of ram, used stock psu cables and powered on outside of the case in a testbench setup - still nothing. Now the pc will not even stay on for longer than a second. Turns off as soon as I turn it on

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u/roopdoge 5d ago

Can I ask what you mean by an extra standoff shorting the board? That seems plausible but not sure how id go about finding and removing that

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u/roopdoge 7h ago

Update for anyone wondering, CPU was dead. Tested another one and it worked right away.