Mickey: PC turning in and off again and again in seconds after changing CPU fan

Hi,
Today I replaced my old CPU fan by a new one. To do so I unplugged everything, unscrewed the motherboard, reapplied thermal paste, etc. Then I screwed back and plugged back everything. But now, it just starts then stops, then starts then stops... And neither my mouse or my screen turns on. Here is a video of the phenomenon:
Specs:
VS550 Corsair
R9 380 msi
CPU fan: purerock be quiet 150w
Motherboard g1 sniper h6
Intel CPU (I dont remember the exact...

PC turning in and off again and again in seconds after changing CPU fan

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