Hummm... Don't have your models, but with the OPTIPLEX 9010 in:

("F1"  "F12" at startup)...  BIOS>  SETTINGS>  "AUDIO" ...  there is a OPTION to turn AUDIO totally OFF (or on).

Hope this helps!

Anthony

Your post is a bit confusing. The speaker ports on those models is a headphone jack on the front and a line out on the back and both are 3.5 jacks. So the question becomes which speaker do you want to disable as those both would require external speakers yet you want to disable external speakers?

Maybe I am missing something is which case SOGLAD5 is on the nose.

Confusing, yes...

The BIOS method should mute all audio...  If you intend to mute only the internal speaker... you should be able to unplug it from the motherboard quite easily (depending on the model).

Anthony

Thank you for your reply, i'll try this :)

I guess you mean the internal, noise maker speaker (beeper/chime)that gets, real wild with POST ERRORS?

one can just unplug them.

or the  optional speaker pair that some put inside  there.

the 3.5mm jack green is line out for power external speakers. (sound and audio , 2channel)

sorry for the confusion, my bad :)

what i meant is i want to disable the built in speaker as some users are using it with some applications and we need them to use the 3.5 jack or a USB speaker.

I'll try to mute it from the BIOS settings.

There is no disable of this speaker.  If its the business speaker you physically unplug it.

Hi , I would like to buy this Dell OptiPlex 3070 MT i5-8500/16GB/m.2-PCIe-SSD256GB/1TB/GT730-2GB/Win10Pro

can anyone help me with this spec. - i need to know if this one has internal speaker? Salesman says that it is not included ..:(

CPU:Intel Core procesor i5-8500 3.0- 4.1GHz, 9MB Smart Cache, 6Cores Chipset:Intel H370 RAM:16GB (2x8GB) 2666MHz DDR4 Hard disk:m.2 PCIe NVMe 256GB Solid State Drive 3.5"1TB 7200rpm Hard Disk Drive DVDRW:No Optical Disk Drive Video:NVIDIA GeForceGT 730, 2GB, FH (DP/DP) Audio:High Definition Audio Network:Realtek Gigabit network adapter (10/100/1000Mbps) I/O slots:1x PCI Express x16 slot 3x PCI Express x1 slot 1x M.2 2280 slot I/O ports: rear: 2x USB 3.1, 2x USB 2.0, 1x Line Out, 1x HDMI, 1x DP, 1x RJ45 front: 2x USB 2.0, 2x USB 3.1, 1x audio Chassis:Mini Tower Keyboard:Dell USB keyboard (Cro layout) Mouse:Dell USB optical mouse, two buttons+scroll OS:Microsoft Windows 10 Pro

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@AndreaSus wrote  i need to know if this one has internal speaker?

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Not sure why you posted to someone else's thread asking for a solution to their problem... 

But yes, ALL Dell Computers come with an internal speaker.

The Dell Optiplex 3070 MT manual indicates that yes, the 3070 MT has an internal speaker.