X570 Phantom Gaming X won't turn on

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   I installed new psu Corsair RMX 850w gold today. PC won't turn on whether I pressed the case power button nor the mobo power button. The psu fan does not start turning at all. All I see is the mobo power and reset button red LED lights flash briefly when I turn the PSU power button on and off, so power is still going from the PSU to the mobo. I already made sure that:

24pin is connected securely to motherboard
8pin cpu power is connected to top left of motherboard.
Ryzen 3700x and wraith prism cooler are slotted in securely.
2x8gb ram is slotted tightly to the 2nd and 4th slot from left.
chasis power
System Panel Header are all plugged in correctly in the bottom right of motherboard

I omitted GPU for the sake of PSU and motherboard diagnosis. I do not have any peripheral plugged in during this diagnosis. I don't know if the inability to boot up is my mobo or the brand new psu's problem. 

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rappy501 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Oct 2019 Status: Offline Points: 25	Post Options Post Reply Quote rappy501 Report Post Thanks(0) Quote Reply Topic: X570 Phantom Gaming X won't turn on Posted: 28 Oct 2021 at 3:21am
	I installed new psu Corsair RMX 850w gold today. PC won't turn on whether I pressed the case power button nor the mobo power button. The psu fan does not start turning at all. All I see is the mobo power and reset button red LED lights flash briefly when I turn the PSU power button on and off, so power is still going from the PSU to the mobo. I already made sure that: 24pin is connected securely to motherboard 8pin cpu power is connected to top left of motherboard. Ryzen 3700x and wraith prism cooler are slotted in securely. 2x8gb ram is slotted tightly to the 2nd and 4th slot from left. chasis power System Panel Header are all plugged in correctly in the bottom right of motherboard I omitted GPU for the sake of PSU and motherboard diagnosis. I do not have any peripheral plugged in during this diagnosis. I don't know if the inability to boot up is my mobo or the brand new psu's problem.

RLGL Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 29 Jul 2018 Location: MN Status: Offline Points: 2025	Post Options Post Reply Quote RLGL Report Post Thanks(0) Quote Reply Posted: 28 Oct 2021 at 11:19pm
	Try clear CMOS.
	Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi

Animalm4st3r Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Jan 2018 Status: Offline Points: 226	Post Options Post Reply Quote Animalm4st3r Report Post Thanks(0) Quote Reply Posted: 30 Oct 2021 at 6:35pm
	What was the reason for getting the NEW PSU? Did your old one break? If not, try using ur old one again, if it works your new ones appears to be DOA. If your old one broke it might have killed something else inside your PC.