Every thing is on theres no indication that the speakers blown but put when i plug in the usb in sound comes at all the computer only recodnise;s it once in a few weeks i know its not my computer because i tried it on 3 other computers and had the same result (but now i get no sound)
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USB speakers are a different animal to standard passive or active speakers.
The USB cable will carry power and a digital signal and the speakers have circuitry to convert this into a stereo analogue signal the speakers require.
Normal active computer speakers with a 3.5 mm jack plug obtain the power from an independent power source, passive speakers require no additional power, but in both cases they use an analogue signal from the sound card.
u need not worry as by plugging in or out want short anything ,but if he has physicaly damaged some thing then i m sorry, but as u noted that the plug of the sound stick does not seat firmly it may be due to it that the sound not coming . try in some other system , hopefully u would find a way out
First things First:
1) check cables, and the input cable to your PC.
2) Check for right voltage, may be somethings is chargind a lot**
3) Power regulator on the Speakers is damage.
4) RMS your Spks, for replace. or warranty.
5) try in another computer. ( if apply)
My problem is fixed now. I plugged the speakers into the earphone socket. There was no immediate effect just silence. I twiddled the control on the bass unit, played with the volume controls on the sticks. Then I realised the sound was back with the external speakers not the internal ones. It was as though the Harman Kardon system was re-booting itself. Very weird.