Is the power light lit up? If not, double check the AC cord is firmly in the brick adapter, and the plug is firmly in the subwoofer with the arrow facing up. The ac cord may look like it is in tight, but not be. Unplug it and replug it to make sure. Make sure the ac cord is plugged into a good power jack. If you have the brick plugged into a surge protector or power controller,make sure they are on (not off, or 'reset') If you still don't have a light, take the brick to a electronics store (radio shack, etc) and have them check the output voltage. A replacement power brick is not that expensive, especially a third party one.
if you do have the light on, try plugging them into an MP3 player, cd player, or pretty much anything with a headphone jack. Hit the vol up (+) a few times.
If they work there, it's a computer sound issue (wrong plug, muted, headphones plugged in, etc) . If it doesn't work using an mp3 player (or equivalent), you may have a bad audio cable, or the speakers may have simply gone bad.
have you tried this control panel sounds and audio,volume,advanced,speakers select the appropriate speakers from the drop down list or navigate to the device manager scroll to system devices + to expand,system speaker right click properties then select use this device (enable) also you might check
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the sound card and the CPU central processing unit dust causes static to build up in a computer
hope this helps
don
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