I would repeat those steps on another computer and also try some other devices...just to be 100% certain it is a faulty port.
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a cable can work?
I have an issue with my p5USB not even turning on. There i 12v going to bolth the hot wires and its grounded good, tested with the multimeter and power is getting to the mole connector fine. I turn it on and get nothing, no lights or anything. Its a brand new unit, never used.
Any idea?
You must have the p5usb plugged into a host device before it gets power. Also please see the technical documentation on the first three links of the product description here if you haven't already.
http://store.mp3car.com/DC_Powered_4..._p/adt-015.htm
How do I get this 12v hub to power on without supplying it an upstream USB connection? I.e. I want it to turn on when +12v is sensed on the Acc wire.