These guides will take you step by step through the safe removal of what are considered to be the Customer Replaceable Unit (CRU) parts of a Latitude 14 (3450) system. (CRUs are the parts of the system that shouldn't need an engineer to remove or replace.
When you have only a High Definition Multimedia Interface (HDMI) or the DisplayPort (DP) cable connected to the display audio works as expected. In the Playback Devices listing you will see the following playback device:
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Accessories for Your Dell
Find products to upgrade or enhance your Dell computer.