Make sure that the computer is completely powered down. If it is running before you disconnect the power cord from the power unit to correctly shut down all applications and the operating system.
Remove the power adapter so it doesn't block the motherboard. Beware of his falling on the CPU fan.
Inspect the motherboard to determine the presence therein of the internal speaker. It is made in a round black casing with a diameter smaller than a penny coin and a height of a little less than a centimeter. In the middle it has a hole with a diameter of about three millimeters, which is visible through the metal membrane.
If the dynamics on the motherboard has not appeared, proceed to the connection of loudspeaker, part of the body. Find coming from the front panel cable, equipped with a wide four-pin connector. Extreme contacts involved, and the average - no, in this case, the appropriate apertures usually even no metal parts. Sometimes instead present two separate one-touch connectors.
Locate on your motherboard the multi-pin connector that is connected to the rest of the cables from the front panel. Look near the connector decoding of the destination contacts. Connect the speaker Jack to the pins designated as SPK, SP, SPKR, SPEAKER, etc. If the dynamics of the two separate one-touch connectors, connect them as if it was one four-pin connector with unused medium-sized terminals.
Install the power supply in place. Close the computer and turn on. At the stage of BIOS boot, you will hear one short beep - a signal that the self test was successful.
Launch the computer application that uses the system speaker. It is best to use real DOS, not the emulator, so the sound is not distorted. Maybe previously you didn't even know that this or that old guys are able to sound.
Advice 2 : How to connect the speaker
In addition to the sound card in the computer has the control unit built-in speaker. The speaker, however, when assembling the machine often forget to connect. It can be useful when running old programs, as well as in the diagnosis of the machine.
Carefully inspect the motherboard. Perhaps a loudspeaker in miniature design for it already there. It has approximately the same diameter as a penny coin, and a black body. If you can't find it, try running the machine without attaching to the motherboard's external speaker. With such dynamics you will hear during the automatic equipment check (POST - Power-On Self-Test) single beep.
If it turned out that the built-in speaker on the motherboard is missing, first try to find a large speaker inside your computer's casing. Sometimes it is not visible for the reason that it's hidden between the metal front wall of the housing and the plastic false panels. But in any case, attached two wire cable with connector on the end. This connector is usually written Speaker.
It happens so that the connectors are not signed. In this case, locate the cable with a wide four-pin connector to the motherboard is not connected. Wire must be suitable both to his first and last contacts and the average must be unconnected, or may be absent altogether. Take an ordinary battery 1.5 V. Insert the first and last socket on the pin and connect them to the battery. If when you connect and disconnect you will hear the clicks, then this is the speaker connector. Do not touch with contacts not to obtain the strike voltage of self-inductance (speaker - inductive element). Then remove the pins.
Locate on the motherboard a combination of pins, designated as Speaker or SPKR. There should be also four. To them and connect (on the dead car) the speaker connector in either polarity.
Start the computer, after which during the passage of the POST make sure that the speaker earned the right. Run any program using it.