Hello, I have a XPS 8700 desktop and about four months ago It started. The power button didn't work whenever I pressed it. It would function when it wanted to. But today it isn't working at all. I press the power button and nothing happens, the button doesn't turn orange. It just doesn't work. Could someone help me? I'm not so smart with computers but there's no use to insist until it functions like it was some months ago. Please help, I'm desperate