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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 ..
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.
If you have built in 10/100 RJ45 then any network connection is possible.
One to one, you can connect to any built in 10/100 RJ45 equipped computer with a 'cross-over' network cable.
More commonly you can connect to a 'router' which allows a number of computers to connect to each other and to the internet . Use a search engine to find net setup on the 'web. This is a very large subject so you need to decide what you want to do first!
See http://www.computerhope.com/issues/ch000469.htm#04 or http://compnetworking.about.com/cs/lanvlanwan/g/bldef_lan.htm or even http://www.microsoft.com/windowsxp/using/networking/setup/default.mspx
Be sure to enable the second screen through the windows display settings. Right click on the desktop background and select personalize (VIsta) or Properties (XP). Click on the settings menu (lower down on Vista, a tab on the right for XP) and look at the monitor setup. After you are connected via cable to the TV, go there, click on the second screen and select "enable this monitor", "extend desktop onto this monitor" or something of the like. Oftentimes it will not do it if you are not already physically plugged in so ensure that you do that first.
Could be one of two things: either the BIOS has lost the settings for the hard drive, which is uncommon unless the PC is more than 5 years old or been electrically shocked, or the hard drive is going bad.
hard drives usually only last about 3-5 years on average. Western Digital even less.