Windows 10: At start up, stuck on either a loading wheel or preparing recovery. Been stuck for hours....

At start up, stuck on either a loading wheel or preparing recovery. Been stuck for hours. Can not get into secure boot. And now just got a watchdog error and computer restarted. Help pleaseI have tried everything that I have read on here

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Surface 3 stuck on preparing bitlocker recovery

My Surface 3 is stuck on preparing bitlocker recovery. I have tried to boot from a usb, but it does not let me.

 

Surface 3 stuck on preparing bitlocker recovery

 

Laptop stuck on Preparing Automatic Repair

Hey, my computer has not gone past the loading wheel screen no matter how many times I restart.
I have not backed my hard drive up , mostly due to lack of money and thoughtfulness. The computer wasn't doing an update last time I could use it functionally, and the last time I went past the loading wheel screen (as I would when the computer was running normally), it froze up and caused the first manual reset I had to do.

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update at 9.47pm uk time
my laptop went black for a moment after being stuck on the wheel loading screen, then rebooted with those numbers in top left, "preparing automatic repair" visible. 10 or so minutes passed and another reboot, back to the wheel loading.