When I plug my iPhone in to my computer with the usb cable that came with the phone the screen says, "Charging is not supported with this device".  How can I fix this?

When I use the same cable with the wall adapter it charges just fine.

LOL     My situation is the opposite.  plug my iPhone 3GS with USB cable and attach to mini adaptor (or whatever the small one is called) and it does not charge. Connect the same iPhone 3GS to my MacBook, using same cable, an charging takes place for iPhone.  Then,  connected the iPhone to the AC power with the large Apple AC  adaptor and it always charges. Seems to be the small adaptor and sometimes a third party automobile adapter.
At first I thought this might be because I was using third party USB cable, but now wonder about that since there are so many problems that others are having. 
Having scoured the discussions, it appears no definitive answer has been given.  Am I wrong. Maybe I never found the answer to what is happening here.
if you can help, please reply to help all of us with the issue still - June 2011.
Thanks!

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