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Your system info shows no sound driver installed. If you have installed the official Dell sound driver for your model of PC but still no sound, this could be because the system has had a PCI soundcard installed, in which case the on-board original sound-chip has been disabled in the BIOS settings.
Option 1 - remove the PCI soundcard, go into the BIOS setup and re-enable the integrated or on-board sound device. To get into the BIOS setup you usually hold down the 'Delete' key as soon as you power up, until the blue BIOS screen appears.
Option 2 - Leave BIOS settings alone. Identify the PCI soundcard by manual inspection, then download driver for that from the soundcard maker's website.
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