MSI Gaming

I posted this in the r/buildapc simple questions thread, but I thought I'd post here as well:

I just built a new PC for the first time in years and am having an issue where the board powers on then immediately powers off. The build:

Motherboard: MSI x670-p WIFICPU: AMD Ryzen 9 7590XRAM: Corsair Vengeance 64GB (2x32GB) DDR5 5200 (CMK64GX5M2B5200C40)Graphics: ASUS GeForce RTX 4070 TiSSD: Samsung 980 Pro M.2 2280 2TB PCIe Gen 4.0 x4Power Supply: CORSAIR RM850x 850W Modular power supply

It's been up and running for about 2 weeks. I updated the BIOS immediately after setting it up. I've been running Cyberpunk 2077 nightly on max settings w/ray tracing, no issue. This morning, I was using it just to browse the internet, reddit, etc... and everything was fine. I switched over to my work laptop to start working, and it eventually went into standby since I wasn't using it. At lunch, I hit the power button to fire it up and the case lights flash, fans spin up, and then it shuts down immediately. No BIOS LED error lights, no beeps. Nothing on screen.

I've removed the graphics card, one of the sticks of RAM, unplugged the case LED lights, and it still happens. I reset the BIOS by shorting the JBAT1 pins. Nothing, still just flashes and immediately shuts down.

I don't have an extra power supply, ram or CPU to test with. Any ideas on how to troubleshoot this? Any way to determine what the actual failure is (motherboard, CPU, powersupply, etc...)?

I've made no changes to the configuration, drivers, bios or firmware in the last week. Only thing I did this morning was play with the case fan LED light settings, but I've unplugged the LED's just to remove them from the equation?

Should I just get the RMA process started on the motherboard? I'd really prefer to not have to tear this thing down again :-/

UPDATE:

Took the CPU out and it stays on. After removing the CPU, I noticed a couple bent pins. Would this cause it to not even stay powered, even though it was working fine for weeks?