I may be a little slow on the uptake ...
The Arduino hardware page does not mention the types of connectors - in particular that you need a micro-USB connection. As this web page usually just gets cut-n-pasted into resellers web page, they will not mention you need one of those either. (Years ago with the Duemilanove - great notices to remember to get type-B USB cable) Possibly with enough surprised end users it will get there, eventually.
But it could be out on the Arduino web page now :)
(Yes I mentioned this on another thread, but I thought it worthwhile to a seperate topic)
Whilst on the subject, I suggest the hardware page lists all the connectors (or on subpage with a picture with arrows/mouseovers). Comparing the Due to (f.ex) the Mega there are 4 more connectors, or put another way, the Mega had one header connector (ICSP), the Due has 4 (SPI, ICSP, DEBUG and one unlabled) apart from the double micro USB (with the label on the reverse side). Some, but not all, are mentioned on the page. Just a thought/suggestion :)