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USB ports not working

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I installed Yosemite 10.10.1 on a HP 8730W.

Sound kext installed, OK

Display full resolution OK

Wifi not working


The USB ports (4) are in system info recognized but when i plugin a USB stick nothing happens.

So there is no access to any USB device. All the ports are USB2.0.

I know the are some kext but they are only for USB3.0.


Can anyone help me?



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