Warning when you are not using your computer, PC, or Mac. Turn it off. A computer only has s many hours of life in it and by letting it run all night you are just wasting it's life. If you don't know how go up to the little blue or gray apple at the top left hand corner of the screen, click on it, find the shut down word and click it. Another window will open and ask if you want to shut down and you just click shut down. NEVER PUL THE PLUG OUT OF THE BACK OF THE COMPUTER EVER!!!