thanks for your response.
No it is not shown as unknown nor as unknown Device, it's just not recognized at all...i first thought i need a additional powersupply, but now it seems its defect
regards
Stev
<t>Hi there...<br/> <br/> i've bought a used trackir3 pro.<br/> If i connect it to my USB my PC not even opens a windows to install any driver, seems it is not recognized at all. Is this a usual behavior (i have not installed drivers before, but windows should recognize a new unknown device?)<br/> <...