u gotta make sure u buy a data cable, not a charge cable.

i wish i knew 100% that "data" and "charge" is the right terminology but if its not, its something very similar.

 

It doesn't matter that the connector is a little different. Connect your phone to PC and check the notification bar. Pull it down and it should show that the phone is charging. Perhaps at some point you checked off the option to not be asked what the phone should do when connected.

 

On android 2.1, go to: MENU/SETTINGS/CONNECT TO PC. There you'll be able to choose what the default action will be when you connect the phone to a PC and whether or not to be prompt it. Things might be a little different if you have a previous version of android, but I think that the option should be there none the less.

 

I have the same issue with my wife's moment. When I use the usb cable that I use with everything on hers it doesn't work, this cable works fine with my Hero my daughter's mp3 player and everything else I've used, but for the Moment, I have to use the Samsung cable that came with the phone.