Pc boot until the Windows login appears then restart 10s after login is displayed

[Manu_B51]

PC boot normally then I see the windows login but the PC restart by itself after 10 seconds. It does this behaviour for ever. Even if I'm quick enough to enter the login and pwd, windows says "welcome" then "restarting"I can only start windows in safe mode.Does somebody have this problem before ? Any idea to solve this infernal loop ? Thanks Emmanuel.

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