How do you shutdown your PC (Computer CPU – not the Monitor)? Start -> Turn Off Computer -> Turn Off! Using this way will take 1 to 2 minutes to shutdown a PC. Want to shutdown PC in one second? Sometimes you need to shutdown PC quickly. 1 second is lightening speed for PC shutdown. Suppose your UPS is going down and you have few seconds left to turn off computer! In this case you want to shutdown PC in a blink. Using this trick can save your time. I can do it in one second and the 2nd second PC will be completely off. At the first attempt, you might take 3 seconds to get it done but with practice let’s hope you will be doing it in one second. Here is the little trick.