First check that the application you are using has its volume all the way up. In the bottom right corner of your desktop there is a little carrot. Click this and then right click the miniature speaker icon and check that the application is not muted. If this doesn’t work you may have to update your audio drivers. Here is Dell’s drivers page: http://www.dell.com/support/home/us/en/19/product-support/servicetag/B3Hwrt1/drivers.