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Postagem original de: markus weiher ,

Texto:

thats most likely a contact issue, had this on many computers.

most usb problems are contact related - one possible problem could be "low voltage" related - measure the voltage of the usb port with a multimeter (and in your case i'm pretty sure that you have at least one of them) - use [http://pinouts.ru/Slots/USB_pinout.shtml|this pinout].

the other problem is that the contacts are "worn out" - or better, simply a little bit bent and not able to close the contact when you plug in an usb device.

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