1, the card, or U disk has a problem, that is to say, the card or U disk is bad, change the U disk to try, if the ring, is the problem.
2, USB socket is bad.
3, the audio speaker cable is broken. So it doesn't ring.
4. The speaker is broken and it doesn't ring.
The first one you can try by yourself, the other several reasons you can only find the repair department to check, or find an electrician to take a look. I hope you get it sorted out successfully soon.
If it helps you, please take it
.