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Determine if the sound card is integrated or an expansion card (Usually a Soundblaster) If using an expansion card, the integrated audio must be disabled in the BIOS F2 at boot) If no expansion card, then in integrated audio must be enabled.
Once the sound card has been determined, make sure that the master volume control is not MUTED and the WAVE audio is not MUTED
Download and install the latest sound driver from support.dell.com