To boot into safe mode from powered off state with Windows 8.1 try this:- Traditionally one presses F8 (or Shift+F8) after Power ON to get to the screen where one could select Safe Mode boot option. However, my Windows 8.1 computer requires a different procedure and it may work on yours: -
- Power ON and immediately press F10 a few times. This brings up “Edit Boot Options” screen.
- Press Esc once. This brings up “Windows Boot Manager” screen.
- Press F8. This brings up “Advanced Boot Options”.
- Scroll to required option (safe Mode/Safe Mode with Networking etc) and press Enter. This should take you into your selected option.