I will make this short and simple.

If your computer can’t boot up without hitting the dreaded blue screen of death, it could be one of two things. A software problem or a hardware problem (not coincidentally, this is all a computer problem could ever be unless it’s the computer owner’s fault). How to get into safe mode is outside the scope of the article.

Here’s the short and simple part: if your computer blue-screens in safe mode with no peripherals plugged in, it is a hardware problem. Take a backup of the drive and try to re-install Windows. If either the backup or install fails, it’s probably a hard drive or RAM problem, but usually it’s a drive problem.