Drum not spinning?

Hi, i dont know much about washing machines. So, the drum is not spinning and I have taken the top cover off and checked the belt. It is fine. I can only presume that it is the motor that makes the drum spin, which has the problem. Although because of my lack in knowledge for washing machines. I do not know. If you could shed any light on this and possibly even give me help to fix it. That would be great. Thank you