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ADI1984 Integrated Audio
The OptiPlex 755 HDA audio implementation uses the HDA 1.0-compliant digital bus from the ICH8 and the Analog Devices ADI1984 HDA codec.
The Analog Devices codec provides the following:
Analog inputs for line-in and mic
A single amplified stereo output connected to front headphones
A line level output connected to back line-out
A mono output for optional internal speaker
Thank You, Dell-Jesse L Dell Social Media and Community
this depends on what kinda audio output you want to install ..but the general idea is to get the audio signal from the computer from the green out in the back on the sound card (it is a 3.5 jack ) ..and there is the stereo out-put for the computer's sound..It can be amplified in any device that has a stereo input on 3.5 jack .. if you want something more complicated..the map of the out-put (the scheme) will be shown in the sound manager (of teh driver ) ..when you make the output changes..This is on a color code..and can be 2+1...3+1..4+1..and the surround 5+1..when you choose surround 5+1 from the sound manager ..it is shown all 3 outputs and the role they play ..bass+center ...Front ...and rear ..they are 2by 2 stereo paired on left and right ..
Just match the color of the male and female on each end. Plug the audio cable (mini stereo phone plugs) to the PC audio line out (green miniphone jack) to the Powered speaker mini stereo phone audio line input jack (green color jack). You will have to set the volume controls of the speaker control knob and at the PC on screen volume control panel.
You might have a cooling problem due to a fan malfunction. It is not clear whether it's the power supply fan or the CPU fan; in the latter case you might also have a thermal coupling problem. The symptoms you describe certainly seem to point to such.
My advice would be to replace the fan (or the whole power supply; you might also want to purchase a "Silent Power" unit for quieter computing). If it's the CPU fan and you are comfortable with, or know anyone comfortable with a bit of PC servicing, you might want to also unmount the heat sink from the CPU and replace the thermal paste between CPU and heatsink. Clean the heat dissipator (the black metal grille over the heatsink) with hot water and a bit of soap and dry thoroughly, or wipe it energically with a dust brush, before mounting the new fan on it.
here is the details of what to plug in your sound card
line output (usually with a 1/8" stereo minijack). You can feed this into a cassette deck or an amplifier (ideally connected to a good pair of near-field monitor speakers) for playback and mixing purposes. If you have a really cheap soundcard, it won't even have this and you'll have to get your output from the... headphone jack (with a 1/8" stereo minijack). You can use this for monitoring while recording, but don't use headphones for mixing. line input (usually with a 1/8" stereo minijack). This is the only thing you should plug any of your musical recording stuff into.