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K90 cannot work at all


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hi all, i just got my k90 this morning and i found a very weired problem of it, here is the detail

my os is win7 64bit professional, when i connected the keyboard to my laptop, the backlights lighted up and the usb hub worked, but the keyboard cannot be recognized by the system and all the keys didn't work at all. obviously i cannot install the driver or firmware or anything. i tried to change the usb port (there are two usb3.0 and two 2.0 on my laptop), but nothing happened.

is there anyone faced the same issue as mine? any idea about it? thanks for help

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