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You will have to be more specific as to what happened and what brand of computer you have. If you reinstalled windows, you will have to use the disk that came with your computer to install the sound card drivers. If you dont have a disk, go to the manufacturer's website and search for them.
roll back the driver
There are jacks located on the back of the computer. Some newer computers will have the same jacks on the front.
plug the speakers in and if necessary download a driver or if there are built in speakers go to sound settings --------------------- Connect a pair of speakers of headphones to the audio jack at the back (usually) of your computer. If there is no jack, you will need to install a 'sound card' available at most major computer retailers.
You need to find the sound card driver. Check the manufacture website for fresh drivers.
If you performed this task with the computer running (power on), you may have shorted out the sound card. Always, when installing or removing any electrical/sound connection from the back of a PC, turn it off first.
It is a bit of hardware inside your computer to translate sounds to electronic signals and back under control of a computer program.
Audio out is a shortened form of "Audio Output". In computer terms, it is where sound in your computer is sent out of your computer. For example, the headphone jack on your laptop or computer is an audio output. It lets your computer "output" sound into an external device like a speaker or your headphones.
The computer allows you to play sound. It also can help you manipulate sound to create sound effects.
No sound oh my computer
An audio file is a type of computer file that stores digital sound recordings. Audio files can be played back on a computer or other digital audio player. They are often used to store music, but can also be used to store other types of sound recordings, such as speeches or interviews.
The sound chip/speakers. You can run a computer fine without a sound system.