Xbox one shows green loading screen but then there is a black screen.

No, the green Xbox loading screen does display for about 30 seconds on power up. Then black screen.

I don't remember some of my emails and passwords so is there a way to backup my data?

It’s a known issue after the update, I think it has something to with the new Microsoft Edge. I finally managed to get my console working again after a factory reset but it now takes a lot longer to start up and it stutters during gameplay. Seems like they’re doing it so we move onto the next console! Absolute joke.

Hello, how are you? My name is Mateus. I'm an Independent Advisor and I'll be glad to help you today.

First, welcome to the Xbox community.

We appreciate your coming to the Xbox community, and we're sorry you're having this issue. I noticed that you've already tried solutions that would normally fix the problem, like accessing the console's troubleshooting mode, this should have been resolved since you would choose to factory reset your console. I recommend that you try the procedure below if you haven't already.

1. Turn off Xbox One.

2. Unplug power.

3. Plug the power back to Xbox One 30 seconds later.

4. Press and hold Bind and Eject at the same time (don't release).

5. Press and release the Power button, and then you will hear the startup chime.

6. When you hear the second startup chime, you can release the bind and eject buttons.

7. Select Reset this Xbox on the screen.

8. Select Keep games and apps.

- If that doesn't solve the problem, it could be something more serious like the corrupted system, which would need a repair or replacement.

*Thank you in advance for contacting, I hope this can help you.

I understand, in this case, then I recommend that you follow the instructions in the article below, to see if you can recover your account information, because once you do the factory reset the accounts are removed from the console and you will need to add them again.

https://support.xbox.com/en-US/help/account-pro...