The audio jack detection or amplifier driver is missing. Fix:

Proline V1165C4 Sound Drivers Download & Installation Guide Restoring audio to your Proline V1165C4

, which often links to a dedicated SharePoint drive for driver downloads. The Intel/Realtek Combo

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The results of this study show that downloading and installing the Proline V1165C4 sound drivers is a straightforward process. The drivers can be downloaded from the manufacturer's website and installed on the system in a matter of minutes.