I’m Frustrated

No sound output

I have a NV bought second hand and I cannot get output of sound when loading a song from USB. I bought a new usb as well. I've tried two windows 10 Intel computers (laptop and desktop) with the serato DJ program installed. When I load a song from USB the light sound indicators show and everything seems to be working but there is no sound. I have all the knobs set to on/12 o clock. My speakers are powered and I've tried the xlr and rca outputs. The only way I can get sound to work is thru rca to headphone Jack aux, and it will play thru xlr to my speakers. My problem is with USB, it won't play sound when loading/playing a song.
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