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Logitech C170 webcam is recognized by system, but shows no video
I just bought a Logitech C170 webcam. After conencting it to various USB ports (since the first did not work), it always does the same thing. Installs a Webcam Video Driver via Windows Update, after which it says it detects the Logitech C170 webcam. I installed Logitech's official drivers and the microphone works fine, but there is no video image.
I tried reinstalling the USB Video Device in Device Manager and restarting, but to no success.
I tried uninstalling the USB Root Hubs in Device Manager and restarting, but again to no success.
I have Windows 7 64-bit version.
The Logitech support video says I should make sure it is not in a USB dock or station and not in USB 3.0 as it is known to cause problems.
I have the webcam in USB2.0 at the moment, or so I believe. it's the one with the red colors on it.
Please advise.