Breadboarding is eliminating everything non-essential to see whether the system will POST. e.g. making sure there there isn't a problem like a short being caused by the case.
H310 motherboards were released with 8th Gen CPUs. e.g. i7
8700k.
You have a 9th Gen CPU (9700k) which was released later on.
H310 motherboards needed an updated BIOS in order to run a
9th Gen CPU. New units of H310 motherboards made after the 9700k was released would have had that BIOS already updated when they left the factory. I think that motherboard makers often add stickers to the packaging to confirm it supports 9th Gen (ASRock did so, anyway). So if there's nothing to say it supports 9th Gen CPUs, it's possible you have one with an old BIOS that doesn't support the 9th Gen CPU.
Also, for some reason, Asus don't list any 95W TDP 9th Gen CPU on that motherboard's supported CPU list...
ASUS Prime series is expertly engineered to unleash the full potential of AMD and Intel processors. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, Prime series motherboards provide daily users and DIY PC builders a range of performance tuning...
www.asus.com
Only the 65W and 35W parts.
Whereas the non-R2 version of that mobo does list the 95W parts:
www.asus.com
So your CPU isn't listed as a supported CPU on your motherboard either.