I have a logitech 5000 webcam which works fine plugged into the usb port of my pc. However when I plug in an extenion cable and then my web cam I get an error message saying that the computer doesn't recognise the device. Previously to this I had a logitech 4000 which worked fine with the same usb extention cable.
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Re: usb extention lead doesn't work with webcam
So you know the cam is ok and the cable, so you will have to point to the usb port not being able to push enough power through the cable to the camera as it must take a higher voltage than the other cam.
Make sure that the other cam software is uninstalled and you have done registry clean in case of conflicts and also try using a different usb port but install the camera with the driver again using the extension in it, aplogies if you did, i am assuming you may have installed the camera directly without the extension cable.
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Check the drivers in Device manager to see if everything is in order. As USBs are plug and play they mainly depend on the firmware being up-to-date, so it may be worth your while looking at logitechs site and checking out your webcams driver. It is also worth trying the camera on another computer and try another USB device on your own. This will eliminate general issues with the webcam and your usb ports.
USB problems can be quickly narrowed down by eliminating issues, so if these dont work come back with any extra details
I suspect that the voltage drop across the lead is enough to prevent the webcam from working. Post the question on the logitech forum Have all necessary information ready Camera model OS Type of USB port 1.1 or 2.0
The only other thing that I would suggest you try to do is (if possible) goto another PC or maybe a friends PC and plug the web cam in. If it does the same thing then the web cam no longer works. If it does work, then you may want to try another USB port on your PC.