USB problems

Good day.There Nexus 5 and he problems with usb.In the Fastboot PC sees it, but not in others.He says the device is turned off or does not write.I tried to change the driver and reflash the device, but it gave nothing.Other Nexus 5 is determined by the normal.What could be wrong?It is unlikely that he died as the USB mode Fastboot everything works exactly is not working at the system level and MTP