Some FAQ's on audio issues:

Laptop Audio FAQ's - Laptop Audio Forum - Laptop - Dell Community

1. "No Audio" FAQ -- if you have no sound from both the speakers and the headphone jack.

2. Headphone Jack FAQ -- if you have sound through the headphone jack but not the speakers.

3. Audio Driver FAQ -- information about audio drivers.

4. Dell Diagnostic Audio Tests -- when you need to know if a problem is in the hardware or the software.

5. HDMI Audio FAQ -- when you want to send audio through an HDMI cable to a TV.

6. Input Monitoring FAQ -- when you want to hear whatever is plugged into the mic/line-in jack.