Cleared fallout 4 "reserved space" as recommended but now system powers on and instantly...

I was finally able to do what you instructed and it was fine up until it came to the login to my microsoft account and soon as I did, it cut off again. I restarted but this time I didnt log in, I just let the screen sit there to see if it would cut off
if I didnt log in and its been about 2 or more hours and it hasnt cut off so theres evidently something in my gamer account causing this problem but I have a lot of games and game data I dont want to lose so what do you suggest I do? Thanks for all your help!

Sorry to hear it. Please try power cycling the console by holding the power button on it for 10 seconds till it shuts down. Then unplug it for 30 seconds. When you power on quickly hold the Sync button (left side near the USB port on the original Xbox
One and just below the power button on the S and X consoles) and the Eject button for the console until you hear a second start up noise.

You should now see a new screen. Scroll over to Restart/Reset and reset the console to factory settings. There is an option to keep installed games and apps so you won't need to redownload them.

Well after reading some of the possible solutions to our problem and trying the recommedation of going under "manage game" of the Fallout 4 icon on his system and then clicking on the fallout 4 reseved space and clearing it out....now the system wont even
load to the home screen. We have to reset the power adapter by unplugging it from the wall and the back of the system and then we get a white light on the power brick then it goes orange and then the system powers its self on but before it has time to even
start loading, the system shuts its self off...I dont know what to do now, clearing out the reserve space made things much worse because now I have no access to anything, someone please help!

I had this happen to me once. It might be your mods that are preventing the game from working. I would try clearing the 2gb reserved space. To do this go to my games and apps, then go to Fallout 4, then on your controller click the start button (the one
that looks like pancakes), then click manage game, under saved data go to reserved space then click the start button and select clear reserved space if that does not work try contacting Xbox support.

I am not sure about this, it would be best to direct this question to Bethesda the game developer.