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Firstly, make sure your computer is not muted! The number of times I have done that is ridiculous. Then make sure that your speakers/headphones are plugged into the correct port. Finally, if you installed the sound card yourself, you will have to reopen the pc and make sure you have plugged the wires into the right ports in the sound card and make sure it is correctly installed in both a hardware and software sense.
A general case might be to take the stereo headphone output of the laptop and feed it a set of left and right line level (not microphone level) inputs to the soundboard. Radio Shack sells a cable that has a typical mini stereo headphone plug on one end and a pair of RCA Phono plugs on the other end. If the soundboard does not have phono jack inputs you will need some type of adapter plug on the ends of the cable phono plugs to match the soundboard's connector.
You then experiment with the laptop's volume control setting (start low) and the soundboard's input level control to get undistorted sound with minimum noise and hum. If you can not get rid of the hum, you probably need to add a ground loop isolation box (also available from Radio Shack, I believe) to reduce or eliminate the hum.
You should have the speaker wire plugged into the green hole. You need to have the correct speakers. Powered ones are best, but they need either batteries or an AC adapter. You need to be sure the sound drivers are installed on your computer. You can go into the control panel and click on the "sounds and audio devices" icon. It should tell you at the top what audio device is installed, and then check to be sure the volume it up over 1/2 and also that the "mute" box is not checked. Then go to sounds tab on that window. The sounds are listed at the bottom of the window. Any sound with a little speaker beside it should play a sound when you press the dark arrow to the right of the sound. If the arrow is not dark, then there are no sound drivers installed on the computer and you'll have to find out why--but that's another issue.
i would advise trying the sound card in a different computer. it may not be possible for you, but maybe you have a friend that will let you try it on their computer. also, can you make the problem come and go by wiggling the connection? on my computer i have to have the wire just right or i lose the left speaker. i think you can solve this without having to reformat. what about headphones? do they work when plugged into the headphone jack?
and that situation plenty of problems may occur. it must the memory card, video card or the processor. but i think the problem of yours is the video card. try to insert the wire correctly from the monitor to the computer, the video card to the mother and if its not then try insert the memory aswell. ive got the same problem just like yours lately but i already configure it out and i found out that the problem was in the video card. i hope that helps you!
Well I guess my problem is a little less important. I have 1-2 3-4 5-? 7-8. I dont know where 6 went. I even checked to see if I could plug a wire into the input and toutch it with my finger to see if I got a vu response, Nothing.