External hard drive will not power up on my macbook pro

I have a 120GB external hard drive that uses a USB port and it use to power up and work but now it just makes a clicking noise and nothing is recognized. the hard drive works on every other computer even pc's. the light on the hard drive is on but does not power up. Can someone help? thanks

hello. thanks for the help. It did come with a usb cable that had two plugs on one end. I never used both because the cord was not long enough to attach to both. I didnt have this problem at first. It would start right up but now it will not start at all. It does have an option for external power supply. Do you think I messed up the usb ports in the computer? thanks again for your help.

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