Usb don't detect devices

my MBA usb port is powered (it charges devices) but don't detect any device (usb key, HD, phone ...)
It freshly installed with lion.
reset SMC & PRAM done.
any idea ?
thx

What exactly do you mean by not detecting?
In Apple Menu / About This Mac / More Info / System Report, in the left column yu=under Hardware, select USB. Are your devices listed on the right in the USB Device Tree?

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