Incompatible audio driver. Fix: Uninstall existing Realtek driver from Device Manager, then install the latest Dell-specific Realtek driver (not generic Windows one).

Windows Update often provides “driver updates” classified as optional. Here is how to access them:

If you prefer a more automated approach, Dell offers a tool called SupportAssist that can automatically detect your system and install drivers:

Before you close this guide, verify you have done the following: