Meu Xbox One liga por alguns segundos e desliga sozinho [Mod Translation - My Xbox One...

Power-cycle your console. Press and hold the power button on the front of the console for several seconds. You will hold it down until the console turns itself off. After the console has been turned off for 20 seconds, restart it and try again.

Translating to Portuguese using bing.com/translate:

Desligue e religue seu console. Pressione e segure o botão de alimentação na parte dianteira do console durante alguns segundos. Você vai segurar até o console desliga sozinho. Depois que o console foi desligado por 20 segundos, reinicie-o e tente novamente.

Hey Hugo

Thank you for taking the time to post this on the Xbox Forums. We understand that you are currently experiencing difficulties with your console turning off, after not displaying anything on your TV or monitors.

I would first suggest connecting your console directly into an outlet, just for testing purposes, as having this plugged into an extension cord or a surge protector can cause the console to behave in ways it was not intended to. Additionally, Its worth taking
a look at the article that covers Troubleshooting Xbox One unexpectedly turning off as it should provide some additional
troubleshooting techniques for you.

Once your console is powering back on, if you still aren't seeing any images on your display, you may want to attempt to

reset your display settings.

Give this a try and let us know if this works for you!

Try performing a hard reset EXACTLY like this. Hold the power button on the console for 8 seconds or until the power shuts down completely.
Unplug the power cord from the back of the console for 5 minutes.
Plug the power cord back in and restart the console.

Hello!

Thank you for posting on the Xbox forums. We will be locking this thread due to it being revived by a new post. If there are any questions or issues that anyone would like to bring to our attention, please create a new thread. We will be more than happy
to answer any questions or provide solutions for any issues. Thank you again and happy gaming!

Conseguiu resolver como?

-[Translation - Did you get it sorted?]