DELL INSPIRON 24 series 3000 / all in one USB PORT PROBLEMS

Hello guys!
i-ve bought this model of pc yesterday here in China (isn-t a fake pc because i've bought directly to the dell shop). The problem is that all USB port doesn't work and also the integrated webcam.
I've tried a lot of solutions, also enter in the administration panel where you can check all elements in the pc.

Please help me, i'm so tired