You've got a bad connection somewhere. Either one of the cables isn't fully plugged in, has some sort of defect in it, or one of the connection jacks is loose and not making proper contact for signal relay. Pray that it's the cable, because if a jack has been damaged, you're looking at getting a replacement for whichever part has the damaged jack. That is unless you, or someone you know, is an old hand at fixing electronics like that.
It should be easy to test the cable. Just take it to the nearest Radio Shack, or electronics parts store, and get a properly gendered cable of the same jack size.
Also, unless the speakers have some system of upmixing audio signals, if you have a stereo source, you're only going to get audio from the front two speakers. That is how it should be. Not sure why this seems to throw so many people... I've probably just had an understanding of this for so long I don't remember what it was like before any longer.
I am having some very strange problems with my LG 5.1 surround sound speakers that I have hooked up to my computer.
I have had the speakers connected to the computer for around 3-4 months now and they have been working perfectly (in both stereo and 5.1 surround sound modes).
On the weekend I moved my computer into a different room and moved the speakers with it. I hooked everything up and switched it on and played a couple of songs which all worked fine. Then about half an hour later I came back and played a few more songs when the problems began.
In the 5.1 surround sound mode the sound started fluctuating greatly going from quiet to loud to very tinny and then to a sort of hard to describe warped sound. Then the vocals would dissapear and sound would come only out of the rear speakers and then switch to only coming from the front. It was very strange. So then I bypassed the surround sound and went to stereo sound using only the sub and the two front speakers. This worked better than before but was still making some strange noises. Since then I have gotten the speakers to work by using the stereo mode but as soon as I switch it to the 5.1 mode it starts stuffing up again.
I have redownloaded my sound drivers and checked that my sound manager is set to 5.1 speaker set up. I dont believe it has anything to do with my sound card or drivers as it was working fine just a couple of days before in the other room. I have also rechecked the wiring to make sure that it is positive to positive and negative to negative from the amp to the speakers.
I have also tried different file types e.g movies, sound etc as I know some songs are only formatted for stereo sound, but shouldn't they still come out of all 5 speakers?
Any help would be great. Im stumped.