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Are you sure the mini USB connector on the Nexus pad is OK?
Try connecting the camera to a computer, and verify that it can be recognized by the computer (and, if a Windows computer, that it can be seen as an icon in the
If the mini USB port on the camera is what is defective, you have to update the firmware through it, so I don't think you can fix the camera that way. I advise sending the camera for repair to Canon Repair Servicing:
They have a good reputation from all I have heard. (You might want to call 1-800-OK-CANON and get an estimate on the repair cost, first, in case your camera is old and not valuable to you... the repair might cost more than you would wish to pay, is all I am suggesting, and getting an estimate first can be useful.)
Good luck with the problem. (PS: have you tried scrubbing out the mini-USB port with a clean dry (used) toothbrush? then trying the cable in it again? dubious, but it might just get it working.)