Why can't my computer see usb devices?

Question

Computers

Such a problem, the computer does not see the flash drive, usb modem, but at the same time the usb mouse and keyboard are visible. Who knows what could be the problem?

Answer 1

Based on the information you provided, I can confidently assert that the matter is in the software or in the hardware.

Answer 2

1) when determining the device, the computer can pick up previously installed firewood, but they are not compatible with this equipment.
2) insufficient power supply of the USB ports (weak power supply)
3) the computer may not "see" the USB flash drive if it is faulty,
as described above