Computer booting but nothing on monitor

Hi,
Today I was using my computer as usual and I got an error message ‘bad pool header’ at which point my computer restarted and shortly after rebooting back up I got another error message ‘irql not less or equal’
At this point my computer started turning off and on every couple of seconds.
After some research I updated my bios off of a USB and my computer booted as usual however nothing displayed on either monitor.
None of my keyboard lights/mouse lights light up either.
Since this issue I have reseated ram, tried booting off 1 stick, no sticks, reseated GPU, CPU and none have been successful.
At this point I’m thinking it could potentially be mobo or psu (thinking most likely mobo as PSU is only a couple months old)
Was wondering if anyone has any suggestions before I go replacing any components?

Thanks