Also remember on laptops, the volume controls may be part of the keyboard.
Download the complete manual for your computer, from the dell website. Look up the volume control operations.
And now, the secret that Dell does not tell you: In order to download drivers from the dell website, you must first download "Dell downloads Manager" or "Dell install manager" after you have downloaded the Dell Manager utility, install it, and restart the computer.
you may find this utility on the dell website...somewhere...
NOW that you have installed that utility manager, go back to the Dell site and load your drivers, directly from the site.
Oh but, in order to install the Dell manager utility, you need to turn all the security OFF first.
Double click the speaker icon in the lower right hand of the desktop, this will bring up the mixer, or single click to bring up the volume control.
But in case the volume is missing, corrupted, or the audio is otherwise non-functional:
you check whichever audio was installed:
click start, control panel, add remove programs, look at the list...
which audio software is shown on the list? delete it, restart the computer.
now visit the motherboard manufacturer or computer manufacturer's website
look up your computer drivers by model number
download the latest audio drivers, save on the desktop...
turn the antivirus off,
if you have multiple security programs installed, turn them all off
(your driver may not install if security systems are turned on)
now load your new audio driver, restart, turn the antivirus back on.
Let the forum know if that solves the problem. SGM