Perhaps your ac adapter has failed or the built in amplifier, if it was bought new or not make sure that u have the correct power supply and if your not sure you do find an adequet replacement w/ matching output specs and polarity. They are not expensive or hard to come by. If that doesnt do it than it is more than likely the built in amp located in the sub. Another way to test the speakers is to unplug them from your computer and plug the same jack into a i-pod or any portable audio devices line out or headphone jack if the speakers make sound with volume there may be a problem w/ your computer or config.
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Yes there has to be a configuration for the 5.4 surround sound... look if the hardware came with a CD to update the sound driver. or Check if the its correctly configured. on the control panel then click Sound, then depending what windows you have have to lookk for the configuration or properties area and configure as 5.0 or sorround etc.
First, power down everything. Second, disconnect the rear speaker and subwoofer from the power source and wait about 5 minutes. Third, be sure the power switch is off on subwoofer and the center speaker. Fourth, plug in the power for the subwoofer but DO NOT turn on the power yet. Fifth, plug in the rear speaker power cord. Sixth, turn on the swtich on the subwoofer (this is the start of the resync mode). Seventh, turn on the center speaker power and the system will change the rear speaker system LED from flashing blue to solid blue in 5-8 seconds. The surround system is functioning again. You may test this under sound in the Control Panel but I would prefer to use a modern music CD that has Dolby Digital Support for 5.1 sound or better. YOU WILL HEAR INSTANTLY THE SOUND DIFFERENCE WHEN THE REAR SPEAKERS ARE CONNECTED.
Mr. Vargas is right mine also won't turn on and upon further inspection I found burn discoloration on the boad where the two power cables are connected. The burn spot is where the four diodes are locaed and the big power cable connection. I am not sure how to replace these diodes or where to find them. Never done this stuff but will try for sure. Please post if you have any suggestions. thanks
Swap the inputs around see what happens
Whether or not the out put is 2.1 or 5.1 has to be the nature of the signal going into the master unit
So have you got the sound card set up right- check sound card software.
Also check the Computer MoBo manual is there a BIOS setting that needs changing?
Also contact the makers website Tech Help if the manual is of no help.
take a look here