Surnay 4 front usb

I've disconnect the wifi module and connected to it's header the front usb.

If I connect a DOK to the front usb i get a green power indicator for a second or so and then it turns off.

lsusb doesn't find the device.

What can be the problem?

What is the correct orientaion to connect the cable?

bump.

Repluged the wifi again, which was recognize properly.

If there are no new suggestion I'll give it a rest for now.