The internal speaker mounted inside a PC-compatible computer case is an important piece of hardware needed for diagnostic purposes. The internal speaker does not handle sound reproduction tasks, such as music, voice or other sound effects heard from external speakers, typically connected to the rear of a computer. Connecting a two-wire internal PC speaker to a four-pin motherboard connection header is an easy task that does not require a great deal of technical knowledge to complete.
Turn off the computer and remove the power cable from the rear. Disconnect any accessories connected to the computer.
Place the computer on a suitable non-conductive work surface.
Remove the thumbscrews or Phillips screws securing the left-side panel to the computer case with a Phillips screwdriver. Slide the left-side panel off the chassis to expose the motherboard. Certain computer cases may feature a one-piece cover design, requiring the removal of several screws located around the rear perimeter of the case.
Examine the motherboard connection headers. Locate the four-pin "SPEAKER" or "SPKR" connection header for the internal PC speaker.
Follow the two wires from the PC speaker and locate the connection ends. Certain computer cases may include single-pin female connectors for each speaker wire while others may include a single four-pin connector for both wires.
Insert the black "Negative" or darker-coloured speaker connector to the first "SPEAKER" header pin. Connect the red "Positive" or lighter-coloured speaker connector to the fourth pin on the "SPEAKER" header.
Replace the case cover and screws. Reconnect the accessories and power cable to finish the process.