Question Motherboard not getting to BIOS, occasionally crashing. DIMM Light is on.

Mar 26, 2019
Hello there,
This morning I woke up and my computer froze at the BIOS splash screen, pressing delete or f2 did nothing.
After doing quite a bit of troubleshooting, the system now displays nothing. It will power on and sometimes stay on for good, but often times it shuts down immediately after booting. Also, occasionally the Cpu light will flash before the system crashes.
The system no longer gets to BIOS splash screen, nothing is displayed no matter what I do.
The Motherboard light occasionally stays on after I power down the PSU, but I think that's always happened.

Steps I've tried:
Every RAM slot with the two RAM sticks I own
Resetting CMOS
MEMOK: Seems to make the system crash
Reassembling the pc outside the case with only essential components (only gpu, ram, and cpu).
PSU Paperclip test seems to work fine.

My specs:
Motherboard: Asus p9x79
RAM: Corsair CMZ8GX3M1A1600C10 Vengeance 8GB 1600MHz x2
Cpu: I can't remember, a 5 year old i7 3.6ghz
GPU: GTX 1070.
Both my gpu and cpu are watercooled.

I have had my gpu and cpu overclocked for many years, temps have always been normal.
Any advice would be greatly appreciated.