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Z2 G4 Power Issue

HP Recommended
Z2 G4
Microsoft Windows 10 (64-bit)

There seems to be an issue with the PSU or either the Mobo. Upon plugging in the machine to power source, the machine turns on and turns off every second and it is looping. The fan also spins then shuts off every second. Can anyone tell me what could be wrong? I hope it's not the motherboard.

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