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When you installed the camera did you use generic Windows drivers? If so, try going to the logitech website and downloading the latest drivers for the web-cam. Unplug the camera before installing the new drivers, it may prompt you to plug in your camera, if not plug it in once the installation is complete. Restart your computer and make sure your plugged in as well if it is a laptop. Another reason for no response could be no power is coming through the USB port, either because the power connection is burnt out (this doesn't mean that powered USB devices don't work in the port) or it reverted to a 1.1 version of USB. This is a common glitch that can usually be fixed by changing USB ports or restarting the computer. Make sure you don't have too many devices being powered only through the USB port. If any USB product also comes with an adapter always use that adapter if possible instead of using the USB to power it. This will ensure a longer life of your ports. If the latest drivers are installed and you know you have a working USB port that provides power then you more than likely have a bum camera. (Electronics generally fail either very early or very late in their life cycle)
check the usb settings enabled in the bios or the cable inside the laptop.In some case the usb cable inside get fault and it will not detect the web cam.In normal case if you plug any usb device it will detect the usb device then the os will show new hardware found and will allow you to install the software for it,if it doesnt detect you cannot install the driver for it and in the yahoo messenger it give the message