I hardly had any issues with Windows 10, to conclude my experience with this specific OS. I’ve started using the OS from the 1st preview builds, was an insider etc.
Yesterday I couldn’t start the OS. Windows logo loads, OS loading animation starts and that’s all. After breaking the load process thrice, Windows initiated the Automatic Repair process and loaded the OS after a considerable amount of time.
As a practice, from years, I always move the Documents and Download folders to a different partition for my user account. This saves me additional time to backup and restore the user files when I need to rebuild the box.
Once Windows finally started, from experiences, I started checking for the partitions and found that two of the partitions on which I had the Documents and Downloads folders “WERE” missing. Now the difficult task was to identify the physical disk. My machine has total 6 disks (2 SSD, 4 various capacity mechanical drivers & couple of them 6+ years old) & after a thorough examination, realized that the disk that was having the “Downloads” and “Documents” folders has a SATA cable that was not anymore holding up it’s physical connection on the port. Once changed, everything went back to normal. Actually the user profile was trying to access the missing disk, causing the lockup during boot.
So, if you have heavily customized desktop computers once in a while, make sure that your connections are in place. Every time you open the case, make sure you are having all the cables checked and insured that tightly secured!