Mac Mini will not power on, checked power supply, what next?

I’m having a problem with my MacMini 2012. I push the power button and nothing happens, no chime. Previously, it would freeze maybe once a month, and I would just hold down the power button to reboot. It happened again last weekend, but now nothing….

I took out both memory modules and it still wouldn’t boot. I also disassembled the unit––there doesn’t seem to be any visual damage to the logic board. I also tested the power supply, and I’m getting a proper 11.8V across the leads according to this post:

Complete Dead - How To Check Power Supply Vs Logic Board

Are there any other diagnostics I can check before I can say it’s positively the logic board that died? Is it possible the power button itself is broken?