Question PC wont POST no matter what!

Feb 5, 2020
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I just don't know... All I remember was shutting down the PC to remove the AIO Cooler to apply new thermal paste. After I turned it back on it wouldn't boot. At first I thought it was the Mobo. So I Rma'd for a new one . Still wouldn't post. I RMA'd the CPU, PSU, and a different memory sticks. Flash latest bios, Hard CMOS reset, using stock cooler. Unplugged boot devices and GPU. I tried everything and it still wont post.
 
Feb 5, 2020
27
0
40
What are the specs for this system (make/model of all installed components)? Hard to help if we don't know what we are working with.
Ryzen R5 3600
Enermax Aquafusion 240mm
MSI B450M GAMING PLUS
16gb XPG Spectrix D41 (3000mhz)
RTX 2060 SUPER
1 TB HDD Western Digital
Samsung 970 nvme 250gb
Corsair CX (Green Model) 750w