Some motherboards do not have an onboard speaker and instead use the computer case speaker which can be removed to disable the speaker.
The picture above shows what a case speaker looks like. The actual case speaker is hidden behind the front panel. Both are generally only used for computer warning beeps or an occasional rare generic sound from a program. Warning beeps are usually heard during startup if a keyboard is not connected, memory has went bad, or something like that. Otherwise, you seldom ever hear the case speaker.
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