Dell Upgrade to 13.04 & amp; 13.10 Нет wifi, драйвер графической карты и проблема Bluetooth?

const colors = ["green", "red", "blue", "black"];
const div = document.getElementsByTagName('div');
const buttons = document.querySelectorAll('button');
let x = 0;
const changeColor = () => {
  div[0].style.backgroundColor = colors[x++];
  if(x === colors.length){
    x = 0;
  }
}

let changeColors = setInterval(changeColor, 1000);

buttons[0].addEventListener('click', function(){
  clearInterval(changeColors);
  changeColors = null;
})

buttons[1].addEventListener('click', function(){
  if(changeColors === null){
    changeColors = setInterval(changeColor, 1000);
  };
})

div{
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background-color: red;
}

<div></div>
<button>Clear Interval</button>
<button>Return Interval</button>