[SOLVED] Newly built PC shuts down every 30 seconds

Oct 4, 2020
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Hello, this is my first time building a pc, and after plugging it in the pc would run normally (fans and lights on) for around 30 seconds before shutting completely off for a few seconds then turning back on and repeat. I've removed the ram and gpu and it still does it. Only when i unplug the 8 pin CPU power supply chord the pc would stay on. The monitor shows no signal when plugged in. What would be the problem?
 
Hello, this is my first time building a pc, and after plugging it in the pc would run normally (fans and lights on) for around 30 seconds before shutting completely off for a few seconds then turning back on and repeat. I've removed the ram and gpu and it still does it. Only when i unplug the 8 pin CPU power supply chord the pc would stay on. The monitor shows no signal when plugged in. What would be the problem?

Start by listing your system specifications: motherboard, CPU,GPU,RAM,PSU,Case (we're interested in the exact model of each component).