Question Motherboard lights turn on as well as fans but doesn't post/boot

Sep 3, 2018
Hi just built my PC today with the specs below and when I first tried to boot it, it wouldn't post, but the fans (radiator too) and motherboard lights did (couldn't get to bios). I've tried checking all of the cables are attached properly, cable was in mobo, tried no GPU at all, also RAM seating. Some of the parts I used in this build have been taken from my old build and slapped in (RAM, SSD+HDD, GPU and PSU)

CPU: Intel Core i7 7700k 4.2 GHz Quad Core (bought used and previously has been delidded using rock-it method)
CPU Cooler: Corsair H100i Pro RGB
Motherboard: Asus Rog Strix B250H (brought brand new)
Ram: GeIL Pristine 16GB Single DDR4 2400
SSD/HDD: WD Blue 3.5" 2TB 64MB 5400RPM , SanDisk SSD Plus 120GB (OS)
GPU: Asus Radeon RX 580 4GB
PSU: be quiet! Pure Power 10 600W 80+ Silver
Chassis: Phanteks Enthoo Pro M Tempered Glass

I've been pulling my hair out trying to troubleshoot, If this is an easy fix, I'm gonna be face palming so hard.
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