4 posts in as many hours, you need to actually give people time to reply.
There seems to be some issue with Intel sound on this particular distribution. You may want to SEARCH the forums as there have been a few other people with similar issues.
Since Linux Mint is based off Ubuntu you may want to search there as well. I took the time to do a quick search and came up with this. If you are running an Intel sound solution this may fix your problem.
Again all this is based off the assumption you are using an Intel based sound solution. If you are using a different sound card/built in sound you may want to post that information as well. You can find more information about your system and what sound drivers are in use by going to System -> Administration -> Device manager
You can also right click the speaker icon in the lower right hand corner of the screen and select Open Volume Control the sound device in use will be in the title of the window. Make sure that the Master and PCM volumes are both set to the maximum position and that they are not muted (red X through the small speaker icon at the bottom of each respective column). You may also want to click on the File menu of the Volume Control and select Change Device, if there are other sound devices there, please try those. If anything, report back with the results of what I recommended and I bet someone can assist you further.