First question that comes to mind is are you using the ORIGINAL cable that comes with the 650? I have both the 650 and 950 in my house and the 950 does NOT work with the 650 USB cable. However the reverse does work. Go figure. I would suggest trying another cable. The socket is a standard micro USB cable.
If this does not work, do you have a USB wall charger that you can try? There are threads here that tell if certain ones worl or not with the 650.
Good luck!
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