I'm trying to build a new server using an MSI X570 Unify and a Ryzen 3900X CPU. All specs should work. But when I connect up the power and try to turn the system on, nothing happens. The backplane makes one quick beep and shows a short little blue LED that slowly fades away. I'm not sure what's going on. At first I tried to use Google and found this forum with other people looking for help. One suggestion for the beep was that the backplane may have been looking to detect fans attached to it. So I tried connecting them to that, made no change. I then tried putting a jumper of the fan detect pins. Still nothing. I'm at the point now where I've got the motherboard disconnected from the power and I'm just testing the power supply by tripping the Power_ON (green wire) with a ground (black wire). Still, the backplane just gives me a quick beep and then dies.
Is my backplane dead? Is it the power supply? Is it the power distribution unit? I'm completely lost. From the looks of it, the power supply won't send full power down to the motherboard unless the backplane is happy. Any ideas? Something I'm missing?
Backplane is a BPN-SAS2-846EL1
Thanks for any help!
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UPDATE
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I disconnected power from the backplane completely. I then disconnected both the 24-pin and 2x8-pin power connectors from the motherboard. Now nothing is connected. Tested the power supplies again by tripping the 24-pin wires. Still get that beep sound, and it's coming from the power distribution unit. Faulty PDU? It's # PDB-PT846-8824.
Is my backplane dead? Is it the power supply? Is it the power distribution unit? I'm completely lost. From the looks of it, the power supply won't send full power down to the motherboard unless the backplane is happy. Any ideas? Something I'm missing?
Backplane is a BPN-SAS2-846EL1
Thanks for any help!
=======
UPDATE
=======
I disconnected power from the backplane completely. I then disconnected both the 24-pin and 2x8-pin power connectors from the motherboard. Now nothing is connected. Tested the power supplies again by tripping the 24-pin wires. Still get that beep sound, and it's coming from the power distribution unit. Faulty PDU? It's # PDB-PT846-8824.
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