"Alek" wrote

|
| Expected it to eventually display the Win10 login screen but it didn't.
???

Keith's theory sounds likely -- a dying disk.
I dealt with something similar in Win8 recently.
The disk was known bad but I was hoping to get
data off of it. It just kept cycling with various
errors.

You could have bad RAM but that usually
manifests more as functionality problems. Like
things work OK but suddenly crash.

Over the years Microsoft have added things
like repair that seem useful, but they don't seem
to do much and can't usually tell you what the
problem is.

I've also tried disk analysis software but got
different results with each one.

You didn't say anything about the type of computer
or whether you have backup. If you have a disk
image you might want to try picking up a new
hard disk and installing it to that. Then see if you
can get your data off the old disk.