Arduino Nano hasn't got power in usb connectin

Hi guys! My new Arduino Nano doesn't switch on when i connect it to computer. Its work only when i connecting it to another Arduino. I just loaded new bootloader to it, but it doesn't work. It new, i bought it at last Friday. I connected it only to usb ports.

sorry for my English.

bad cable?

i tried other cables and other computers

Nortti: Its work only when i connecting it to another Arduino

How are the two Arduinos connected?

To Ground and 5V. When it connected to another Arduino, Usb can works like a COM port and i can load some sketches to it. But it doesn't ake power from usb.

If you've verified the cable works on others, sounds like the USB port may not be soldered correctly. Could also be the power selection diode that is causing the problem.