You've already shown that it doesn't work on two different computers. Not so silly to spend a few bucks rather than tear your hair out. How much is your time worth ?
Just trying to help.
My point is you're ignoring one of the basics of troubleshooting. Chances are if it fails on two different computers the webcam has a hardware fault -- and its sudden failure suggests that rather than, say, a driver issue.
I suspect there's nothing to add to the base of existing knowledge except that this brand isn't especially reliable.