oloo.js

function Device(power) {
  this.power = power;
  this.turnPower = function() { this.power = !this.power };
}

Device.prototype.sayHello = function() { this.power ? console.log('hello, the power is on') : ''}

function Computer(proccessor, memory) {
	this.proccessor = proccessor;
	this.memory = memory;
    Device.call(this,true);
}

Computer.prototype = Object.create(Device.prototype);

Computer.prototype.constructor = Device;

var IBM = new Computer('133MHz','16MB of RAM');

IBM.sayHello();
IBM.turnPower();
IBM.sayHello();