Xbox remains completely dead

Hi,

I’m facing an issue with my Xbox One. My Xbox won’t boot at all. It’s completely dead.

Already replaced the Front Panel Board, but this didn’t resolved it.

Tried with a working PSU, still no sign of life.

Checked motherboard, everything looks fine so far I can see.

Do you guys know what component could cause this ? I’m thinking about the motherboard. But maybe you guys know if there is anything else, which can cause this too ? And if I replace the motherboard, I know I need to replace the drive it’s PCB. But do I need to do any modification on the HDD ?

Any help is appreciated!