Sadly this does not mean the cable is OK.

by R. Proffitt Moderator - 5/8/12 11:48 AM

In Reply to: Web Cam in Dell SP2309W by hlesley

I've seen this happen as the USB falls back to 1.1 speeds and not work with web cams.

HOWEVER the device manager is a clue. Did you try the usual remove the device trick?

Did you try it this way (see video)?