Signal Energy Speakers ESW V10 Subwoofer issues

If the blue LED on your Energy ESW-V10 subwoofer is always on but the woofer won't turn on regardless of the switch position, it's possible that there is an issue with the amplifier or power supply. Try checking the power cord and making sure it's plugged in securely. If that doesn't work, you may need to have the subwoofer professionally repaired or replaced.

Question edited for clarity, full 'make model (what it is)'.
Question moved form Computers to one of the Energy categories.

Ask the company direct. They probably aren't meant to be opened.

https://www.energy-speakers.com/products/subwoofers/?sku=ESW-M6

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That much voltage can damage components before a fuse blows, http://www.energy-speakers.com/support/

Definitely need more info - such as type of amplifier or receiver, how many speakers you are running, whether the subwoofer is powered or not.
As a simple test procedure: Disconnect all speakers and plug in a pair of headphones. Get a strong audio signal? Good, move on. No signal or week signal, you have an amplifier issue before the audio even gets to the speakers.
Next: Disconnect all speakers, turn the volume down, and connect one speaker to the left output channel. Slowly increase the volume. If that works, do the same on the right channel. Everything OK? You're putting out enough gain on both channels. Sometimes one channel goes bad. You can still listen to your sound in mono moder, or drive two speakers from the single working output. Not stereo, but dual mono. Move on.
Connect left and right speakers but not the subwoofer. Repeat the test. Whatever is left is probably the problem. If the subwoofer is powered, check the power supply or incoming voltage. If the other speakers are driven off the subwoofer or powered from there, that's likely the problem.

Power Mode (rear-panel): This switch can be set to either On, Off, Auto. If the switch is in the Off position, the subwoofer will not power up. If the switch is in the On position, it will constantly remain on. If the switch is set to the Auto position, when a signal is present the subwoofer will turn on and will automatically turn off several minutes after a signal is no longer present.

Get a new box

if you short a sub it will hum try connecting it to a working speaker (no amplifier) if you have access to rear of sub check for wire only needs to be the size of a hair arcing out the speaker, i have a sub that does that on only one output (left rear) its actually the stereo causing it to hum..

Did you check the fuse (pop out cassette just at the power input point)?

Did it ever work? Are you certain the sub is getting a signal. It has to be defined. How about the speaker levels adjustment? Did that work? Give us a clue.

I have the exact same problem with my S8.3 that I purchased a few months ago. It's just the blue LED that doesn't light up, otherwise it seems to output bass and the volume control works. Any suggestions?