Because the computer speakers (On the bar at the bottom) and the wired speakers both have to be on. If one is off and one is on, it will not work. Be sure both speakers are on and are close to the same volume.
A number of things. Is the audio cable plugged into the green jack tightly? Is the power pack plugged into the wall and into the speakers? Is the "volume" control on your computer muted or turned all the way down? Is the sound card working properly? Good luck.
The pink, blue, and green slots on the black of a computer are designed to connect input and output audio devices. Pink is for the microphone, blue for inputs like turntables, and green for speakers.
Find your sound card (The card with 3 or more different headphone jacks), and install the cord from the speakers into the 3.5mm Green Jack, or the one labeled Speakers.
Okay, we need to check a few things before we jump into the control panel. 1. Are the speakers plugged into the right socket? Usually the green one is for speakers, but it wont hurt to try them all. 2. Do the speakers require power & if so are they plugged in & turned on. To narrow down your odds, you can plug your speakers into an mp3 player, or plug headphones into your computer to verify stuff is working. 3. In volume control, is the sound muted or turned all the way down? Youd be surprised how often ive found myself troubleshooting speakers or drivers when it was just muted somewhere... 4. If you have no volume control icon in the system tray, this could be a sign that your soundcard drivers are missing, see the related question "How do you get sound drivers?"
Plug the power plug into a wall socket and plug the jack into the green port on the back of your computer. The speakers probably have volume on them but you can change the volume from the computer if you want by pressing Start -> Control panel -> Sounds and Audio devices.
nowhere, the Central Processing Unit is the "brain" of the computer, you have to plug them into the either Green or Black headphone like jack on the back or front of your Computer Case or Laptop.
The same way any set of speakers works - by sending an analog audio signal to an amplifier connected to the speakers. Whether the speakers are integrated into the monitor or stand-alone units, the wire from the speakers/monitor must be connected to the audio output of the computer. This wire terminates in a 3 conductor mini-phone plug. The jacket of this plug and the proper jack on the rear of the computer are usually light green in color. Under the jack, the mounting panel will have 'SPKR' etched into the metal/
The speakers are an output device because they are delivering data from the computer to the user. Speakers, monitors, and printers are examples of output devices. Keyboards, mice, and tablets are input devices. Devices that are i/o devices (input and output) include floppy drives, hard drives, cards, and USB drives.
Find the audio-out port on the back of your PC or side of your laptop (usually a green marker with a picture of headphones or sound waves), and plug in headphones or speakers. If you only have the white and red stereo cables, head over to a wal-mart and buy a "Y-Splitter" so that it will fit into the computer and plug your stereo cables into the splitter.
For sound cards: Check the back of the computer. If you have some headphone-looking ports in a rectangular shaped metal cutout back there (and there are more than one) put the speakers in the green port. For Computers without sound cards: If you don't have one, look for the mouse and keyboard ports. Close to those, there should be around 3 headphone-looking ports, put it in the green one. Also, it would greatly help if you included the computer model number.
Make sure your computer settings have allowed the aux output of your computer to actually act as an output - some computers have a 3.5mm input (the aux input) that acts as both an input and an output (the Macbook Pro 13inch is an example) and in control panel you need to set it to output, no input. Also, if you have several 3.5mm input/outputs then you need to make sure you're plugging the speakers into the right plug - it will be a green one that usually has a picture of some headphones next to it. It may be an issue with your speakers, test with an iPod or something similar to see if they even work. Sometimes it is even just an issue with your volume on the computer when you put the speakers in, check for that, too. Hope this helps.
Only 2 percent of the world's population has green eyes.