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@Gemma , here is Sprint's guide specific to your model phone. The only reason I can see it not working is older or bad USB cable, or underpowered USB port on laptop if docked using underpowered power supply, port turned off in BIOS or bad port.
http://eguides.sprint.com/support/e..._files_between_your_phone_and_a_computer.html
http://eguides.sprint.com/support/e..._files_between_your_phone_and_a_computer.html