The answer to this question depends on the computer's motherboard, its configuration, and the installed software.

If multiple audio output devices are available, check that you have the appropriate one selected. Here's how: Select the Speakers icon on the taskbar. Next, select the arrow to open a list of audio devices connected to your computer. Check that your audio is playing to the audio device you prefer, such as a speaker or headphones.
Dynex 5.1 Desktop Internal PCI Sound Card P/N: DX-SC51 Onboard connectors: 1 CD stereo audio input, 1 auxiliary input and Wavetable MIDI connector External connectors: 3 line outputs, 1 headphone output, 1 line input, 1 microphone input, 1 digital optical (SPDIF) output.
Under the 'Output' tab, select 'Internal Speakers' or 'MacBook Pro Speakers' Windows. Click on the Start Menu in the bottom left corner of the desktop; Click on the Settings cog; Click 'System' Click 'Sound' Set this to your computers Speakers/Built-In Audio device.

On your Mac, choose Apple menu System Preferences, click Sound, then click Output. Select the device you want to use in the list of sound output devices. All sound output devices available to your Mac are listed, including the computer’s internal speakers, devices plugged into your computer’s sound port , USB speakers, and AirPlay devices.

Note

These steps are for enabling the internal speaker that makes basic noises. Texas instruments 1394 ohci driver. If you have problems with playing music or sound in videos, see: Why do my computer speakers not work?

Disabling the internal speaker

Software

If you're running Microsoft Windows, you can disable the internal speaker or PC speaker by following the steps below.

In Device Manager, click View and select Show hidden devices. Once done, Non plug and play Drivers becomes visible in Device Manager.
Expand Non plug and play Drivers by clicking the plus and double-click Beep.

Note

If you do not see a Non plug and play Drivers section in the Device Manager, skip to the Motherboard jumper section below.

In the Beep properties window, click the Driver tab.
On the Driver tab, if you want to temporarily disable this device, click the Stop button. If you want to permanently disable this device, under the Startup type, select Disabled.

Motherboard jumper

If the steps above don't disable the internal speaker (i.e., there's no Non plug and play Drivers section), the internal speaker can be disabled by the motherboard jumpers. Many motherboard manufacturers have jumpers that, when jumped or not jumped, enable or disable the onboard speaker.

All motherboards are different. Refer to the motherboard's documentation to determine if your motherboard has such a jumper, and how it should be set.

Motherboard cable

Some motherboards do not have an onboard speaker and instead use a computer case speaker that can be removed to disable the speaker. Refer to the motherboard or computer's documentation to determine if your computer is set up this way.

Enabling the internal speaker

Software

If you are running Microsoft Windows, you can enable the internal speaker or PC speaker by following the steps below.

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In Device Manager, click View and select Show hidden devices. Once done, Non plug and play Drivers becomes visible in Device Manager.
Expand Non plug and play Drivers by clicking the plus and double-click Beep.

Note

Internal Speakers Missing From Output Mac

If you do not see a Non plug and play Drivers section in the Device Manager, skip to the Motherboard jumper section below.

In the Beep properties window, click the Driver tab.
On the Driver tab, if you want to temporarily enable this device, click the Start button. If you want to permanently enable this device, under the Startup type, select System.

Note

If the internal speaker does not work after enabling it through the Device Manager, the internal speaker may be defective and non-functional. In this case, usually, a motherboard replacement is merited, as it is very difficult to replace the internal speaker on the motherboard.

Motherboard jumper

If the steps above don't disable the internal speaker (i.e., there's no Non plug and play Drivers section), the internal speaker can be disabled by the motherboard jumpers. Many motherboard manufacturers have jumpers that when jumped or not jumped enable or disable the onboard speaker.

All motherboards are different. Refer to the motherboard documentation to determine if your motherboard has such a jumper and what its setting should be.

Note

If the internal speaker doesn't work after enabling it with a jumper, the internal speaker may be defective and non-functional. In this case, the motherboard would need to be replaced or repaired by a technician.

Motherboard cable

No Internal Speakers In Output

Additional information

Internal Speaker Output

See our internal speaker and speaker definitions for further information and related links.

Internal Speakers Output