Unplug it and wait till the light goes out in back try again happened to me once that worked
You may need to “find a friend”, nearby who has a working PC, preferably with the same OS as you have. Using their PC, download some utilities (anti-virus and diagnostic), and create a clean boot disk (CD or DVD) or a boot USB drive. Then using that boot cd or boot drive, reboot your computer and run the utilities. This is one reason why I have multiple computers - all running the same OS.