Surface crashing on start

Question

Hi! My Surface is not turning on anymore, and no guide online seems to cover my case. Pressing the start button turns it on alright, displaying the Windows logo for about 2 seconds, before abruptly turning off. It's not the first time I had the issue, but it usually went away after a couple of tries.

It's getting power from the official power cable, it's not overheating, there's no connected add-ons, and from the exterior everything seems alright. Mainting the power button pressed gives the same result (logo appears at first, disappears after 2s, reappears around 18s into pression, and disappears again after 2 more seconds). Neither the double-button force shutdown (not sure the Surface registers the Volumn Button input) nor the keyboard start up shortcut (keyboard appear unresponsive) work.

Any idea on what could be causing the issue?