9 Legend

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47K Posts

November 1st, 2020 23:00

Sound doesnt work correctly without the OEM Driver and internal speaker is not really a sound system.

https://www.dell.com/support/home/en-us/product-support/product/optiplex-755/drivers

 

Analog devices windows driver AD198x

https://dl.dell.com/audio/R164900.exe

 

 

4 Operator

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20.1K Posts

October 26th, 2020 07:00

Try adding external speakers if you have not already done that. You should have said which of the 4 models of the 755 you have. Manual here-- https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-755_user%27s%20guide_en-us.pdf

367 Posts

October 26th, 2020 14:00

  1. You should check to see if your earphones are plugged in all the way.
  2. Look for damage to the headphone plug and the jack on the pc
  3. Try the rear jack on the pc (there is two of them use the green one)
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