Aurora R10, power issue

Hey everyone, thanks in advance for any further troubleshooting steps you can provide. First let me list the full specs and then the issue

Alienware Aurora R10

• GPU: Nvidia GeForce RTX 2080 SUPER
• CPU: AMD Ryzen 9 3900 12-Core
• RAM: 16GB DDR4
• MB: Alienware 0NWN7M
• Storage: Hardrive, Seagate Barracuda ST2000 1TB, Samsung SSD 970 EVO 2TB PSU: Alienware Gold 1000W

My computer will not boot at all unless I unplug the power cord completely, then press and hold down on the power button until I hear a click, which I believe is the PSU's relay resetting. After the click I plug the power cord back in, and it boots as normal. When it DOES NOT boot, it turns on, my mouse and keyboard light up, then within 2 seconds the mouse and keyboard shut off, the monitor never comes on, the computer remains powered on and I can hear the fans spin. I tried the following:

-Factory resetting to clean windows 11

-Reseating HD, SSD, RAM, GPU

-Booting with 1 8gb RAM stick sepearetly two times (to test to see if one of the RAMs are bad)

-Upgraded from 500w psu to 1kw psu, both were genuine alienware PSUs

-Replacing power cord for PC

-Booting with completely different mouse, keyboard, and monitor

I at first thought the PSU was bad (still drawing power but not enough to boot fully, only enough for fans + light), so that's why I replaced it. I'm starting to think it's something with the motherboard?

Thanks in advance, I'm truly stumped.