Only one speaker works

your speaker connections are plugged in incorrectly or the speakers are not plugged in and powered on.
check the back of the computer where your speakers are plugged in and make sure you speakers are plugged into the right colors

CHECK THE MENU,,SETTUP ,,NO RECIEVER NEEDEED,,IF NOT CHECK THE RAC JACKS

use another device like your i pod to make your jbl sounds louder and then plugged it to your pc without turning it off. after plugging try to test it if works.

Do other speakers (that you know to work) perform correctly when you plug them in?

Let me know.

Derek

it sounds like the headphones shorted out the usb on your system, you might try some speakers that are not usb and see what you come up with,,,also check and make sur your sound isnt muted on the master control for the volume

Turn the volume on the right speaker up?

have you tried upping the volume of your speakers?

carefully plug back the minijack for the speaker at the out or spk,
normally the sound card has three ports 1. for MIC 2. LINE IN 3.OUT (SPK) - SPEAKER.
carefully plug the minijack for the speaker into the third one - OUT (SPK) - SPEAKER.
in pluging it in, first put on a media clip on the windows media player and carefully plug in the minijack for the speaker and surely you will hear sound.

UZOWUANYA
e-mail: [email protected]

I had this very same problem and I had my system for about 2 weeks. I have seen a lot of similar posts on this site so it seems that this problems happens a lot. For some reason my right speaker just stopped working so i came to this site for help. I looked at alot of posts and nothing fixed the problem. when i switched the right speaker to the left input it started to work so I knew the speakers were fine. So i finally decided to unplug everything and restart my laptop. Once my laptop rebooted I plugged the sub back into the wall after about a minute of it being not plugged in. Then I plugged all the the wires and volume control back into the sub and turned the switch back on. Make sure the volume control is down when you plug everything back in. Then plug the wire into the device, which in my case was a laptop, and start to play some tunes. Right away everything was working perfectly fine again and no problems ever since...for me atleast.

HOPE THIS HELPS

Ok There is another chance to work your speakers ,

  If you have your mother board CD , get play that  and  reinstall the sound system .

  I hope it will work ,      please do reply