Hi everyone,
I have a problem with this dell mini desktop, no LED lights up and there is no response from the front power button. It literally feels defunct, with no feedback whatsoever.

IPCML-CT motherboard rev.A00
CPU: Intel Celeron G5900T

I tested the power supply (19.5v correctly) but to be careful I also used an alternative power supply to test, nothing. No LEDs, no power on.

I tested the power button pins and they correctly measure 3.3V, so when I press the button or put a bridge with a wire, the pulse seems to be there correctly.
...

uhh, really?
What a sadness, I was hoping it would be simpler. if it requires an additional controller I avoid making further expenses. I thought I could get by with some soldering and maybe a DC power supply... so I give up. Thank you for your patience and kind response....