Sound

There is an OEM audio codec that requires the OEM driver to work.

Speaker is replaced by buzzer for beep codes. There are many drivers not included in WINDOWS media.  They should be installed in this order.

https://www.dell.com/support/home/en-us/product-support/product/vostro-3888-desktop/drivers

https://dl.dell.com/FOLDER06073535M/5/Intel-Chipset-Device-Software_5J88W_WIN_10.1.18267.8194_A11_02.EXE

https://dl.dell.com/FOLDER06247465M/1/Intel-UHD-Graphics-Driver_9MT81_WIN_26.20.100.8141_A00.EXE

https://dl.dell.com/FOLDER06667768M/1/Intel-Management-Engine-Interface-Driver_3FF8M_WIN_2036.15.0.1835_A00.EXE

https://dl.dell.com/FOLDER07042991M/2/Realtek-High-Definition-Audio-Driver_KKYCX_WIN_6.0.9116.1_A08.EXE

https://dl.dell.com/FOLDER06009135M/4/Waves-MaxxAudio-Pro-Application_M96FF_WIN64_3.0.30.0_A02_01.EXE

There are no built in speakers in the 3888 or for that matter most Desktops.

There is a Line Out jack on the rear panel that can be used for computer speakers (powered type) and a jack on the front panel for headset or speakers.