I have Creature III satellite speakers and subwoofer. When the unit is plugged in, the green light comes on but no sound comes out. I tried substituting another connection lead to the sound source from the one supplied but still nothing. Do you have any suggestuons or is the unit faulty?

The pre-amp is defective. Get them replaced.

You could just have a loose wire inside the speaker but sometimes one speaker will just go to speaker heaven. Sorry I can't give a better answer and I don't know that brand so I don't know if you can open up the speaker easily to see if there is a loose connection. Now, sometimes the plugs can just wear out too which can be replaced if it is a great set of speakers but again, back to the lack of knowledge about that brand and how hard it is to work on.

You may find some on the Internet (use Google) or on EBay.

A wire inside the cable has probably come loose, unless you (or a friend) have decent soldering skills to just replace the wire form the audio controller (most likely spot to have problems) to the PC they are probably just trash.

First go to this site and download and install this codec pack. Also, make sure you have your speakers set as you default sound device.

JBL Creature 2 are a computer speaker system designed and sold by JBL. The system is made up of two satellite speakers and an omni-directional subwoofer. The speaker system connects directly to a computer's available sound card output jack or a laptop's stereo output jack. Occasionally, problems can occur with the sound quality and connection with the speaker system. If there is no sound coming from the speakers, check the cable connections. Ensure the satellite speakers are firmly connected to the matching jacks on the back of the Creature's subwoofer. The connections are color coded and, in addition, each speaker connector is shaped differently to fit only into one jack. Ensure the output cable is firmly connected to the subwoofer audio in jack and the computer's audio-out jack. Ensure the power button on the back of the subwoofer is pushed inward. If everything is connected properly, the green lights on the underside of the satellite speakers will glow.If there is still no sound, tap the right-hand side audio-increase button on the right satellite speaker until sound is heard. Also ensure there is audio playing from the computer. Double check the lower right-hand side of the window's main screen and look for a speaker icon. If the icon has a red slash over it, click the icon and uncheck the "mute" option.

Hope this helps

Check out here:http://www.fixya.com/support/t3604714-jbl_creature_speakers

make sure you plug the subwoofer into the green jack port on your pc.

Don't know if you've solved this yet but just in case ...
There is nothing to install with loudspeakers - they are independent devices and have nothing to do with your computer.
Check the little lights. There should be one on the back of the subwoofer (by the power switch) and one underneath each of the satellites. If you haven't got the lights under the satellites then you probably have a faulty subwoofer. Check thought that your connections are solid.  Remember the two satellites' connectors are keyed and may not be fully home, rotate them slightly until they click completely in.
Theses are excellent speakers and should be deafeningly loud.

Its not a problem, but all you need to do is push the pins at the back a little more...I know it feels like pins are all the way in, but they really aren't.