yeah type alsamixer and enable it. it may be muted as default. or click the little speacker icon and enable the speakers either way alsamixer or pulse it all does the same.
Your Question
Before posting, it is always a good idea to know exactly what your questions is. That sounds strange, I know, but too often we see short, one line questions which need lots of further questioning until we can see the problem. In fact, the best thing to do is to run a Search first - chances are, your question has been asked and answered over and over again already. Another great resource is the LQ Wiki - there are a large number of articles, many dealing with diagnostics.