Your Pc system uses and insignificant amount of energy, there is no point in try to save power by fiddling with switching bits on and off...you will break the switch. If you are trying to save power, boil the kettle less once a day, this with save you a day is worth of pc power. Theres many other ways to save power, think of things that get hot, Hot water heater, electric fire, and lighting. All these things are far ahead of your PC. If you have an old TV scrap that for a LED type, an old washing machine. Especially an old frig that is more than three years old will really gobble up power scrap that. Dishwashers do not use that.