MegaWorks THX 5.1 550 Speakers power light comes on but no sound

Grand kids were watching movies on my computer system this summer and my speakers no longer work. When my wife booted up the computer she heard a loud pop and since then I have had no sound. Checked the sound card and needed to install new drivers for it to work but still nothing from the speakers. Sub woofer used to pop (softly) on boot up but nothing now. Power indicating green light is on.
Any suggestions?

Hi Amisk4746,
Can you double check the connections? Disconnect your speakers system and test the individual line outs of the sound card/onboard sound using a pair of earphones. If possible please test speakers system with another computer, that should tell you if it is working properly.

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