Motherboard won't power up with CPU power connected

Micro-star international / X399
February 14, 2019 at 17:39:42
Specs: Windows 10, AMD 2990/64GB
This is a possible answer to an old thread, not really a question. I had a problem with a new build, where I could power up the MB with the 24-pin connector, but not if I plugged in the 8-pin CPU connectors. Everything online told me I had bent pins in my CPU socket or an otherwise bad motherboard, but I couldn't find any evidence of that.

I'm ashamed to admit it, but I had plugged the 6-pin GPU connector on a power cable into a peripheral power port on the PSU, and the 8-pin end into one of the CPU power ports. Once I replaced that with the correct 8-pin-8pin cable, it powered up just fine.

I wish these cable-ends were fool-proof, because apparently I'm a fool.

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February 15, 2019 at 00:54:14
We make mistakes, we learn, we improve. No need to be ashamed at least you learnt something and resolved your own problem. Sometimes it is fun to diagnose a problem, annoying but fun. At the end of it though you learn and improve. Well done and thank you for letting us know.

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February 15, 2019 at 13:00:34
At least that mistake didn't fry your MBoard. There are some easy to make ones that can.

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