Question Crypto rig will not remain powered

[Devoidicus]

-System Specs-


MotherBoard: ASUS Prime Z370-A II (Intel 9th Gen) DDR4
RAM: Patriot Viper Elite Series 4GB 2400MHz Single Channel Cas 6 DDR4
CPU: Intel Core i5-9400 Desktop Processor 6 Cores 2. 90 GHz up to 4. 10 GHz
GPU: ASUS Dual GEFORCE GTX 1070 8GB OC Computer Graphics Card
SSD: Western Digital 500GB WD Blue 3D NAND Internal PC SSD - SATA III
PSU: Corsair HXi Series, HX1200i, 1200 Watt, 80+
Case: Mining rack

-PROBLEM-


I can't get this thing to power on for more than about a second at a time. Certain lights for the PCI and other components wink on and then off upon hitting the power switch. I have already replaced the motherboard once, and I will admit I am stumped as to what the problem is. Any ideas as to why it won't work? Any and all suggestions are appreciated.

 

[Ralston18]

Old build mining rig that was working and has suddenly developed the problem or a new build mining rig?

My first thought is a thermal CPU shutdown due to immediate overheating. Thermal paste: brand, how applied?

CPU cooler?

My second thought is a electrical short somewhere in the build.

What are those "certain lights"?

Did you happen to mix and match any PSU modular cables from other PSUs?

 

[mdd1963]

Remove GPU, disconnect drives, and retest...

 

[Devoidicus]

Thermal paste was stock with the CPU so I have no idea what brand that was. CPU cooler is a fan attached directly to it. I can double check for any obvious points of contact that could cause a short, but there are no obvious causes. No I have not mixed and matched PSU cables. The light I reference is the PCI power light winking on and then off. So I know the board itself is receiving power.

I will try what mdd1963 has suggested and remove GPU, disconnect drives, and retest.