|Control Panel> Hardware and Sound> Sound|
Make sure that your speakers are recognized.
Make sure your sound is not muted.
If not recognized, try unplugging an plugging back in while the machine is on, it will then ask you to set it up. You then need to indicate then whether you are plugging in speakers, mic, etc. and follow the steps.
You have to be a little bit crazy to keep you from going insane.