PC does not recognize the beaglebone black

Hello, I have a problem with the beaglebone black. The board cannot be recognized by my PC when I plug the board through USB. I have tried to connect the board to other PC (Mac, Linux (with dmesg), Window) but no PCs detect the board. I have tried also through the ethernet port to test ssh, etc. but I didn’t get anything. Does anyone have the same problems?