Shows connection error to computer

I have had issues connecting the camera to my computer (mac) for a while. I was trying to update the software and it requires a connection to the computer. When following the instructions to update, at the point of connection it stops and says - turn off camera, take out camera battery and reboot this software. I have done both a couple of times, and keep stalling when i get to the same point. It then just says the camera needs a service. I don't have a repair centre near me....