[admars]

when you start it up, is it trying to do a chkdsk ?

do you have a windows 10 dvd/usb? with a bit of luck you can boot doing that and get it to repair.

it may just need a chkdsk /f/r which you can do I think from the rescue.

I've had my machine not start, used the rescue option to "fix this pc if windows won't start", waited ages and it's been fine. so fingers crossed for you.

when you get it working, look in eventvwr so you can see if there are any hardware errors, or whether it was just a case of an important file getting corrupt.