How to Safely Power Down Your Computer in a Crisis. In urgent situations where your PC becomes unresponsive, knowing how to perform an emergency shutdown is crucial. Start by pressing Ctrl Alt Del to open the security options screen, then hold down the Ctrl key and click the power icon to select Shutdown or Restart. If this method fails, press and hold the physical power button for 5-10 seconds until the computer powers off, though this risks data loss. As a last resort, unplugging the power sou