My 13-inch Macbook Pro is making a loud fan noise. I have taken the unit through to my Apple Service centre in South Africa and they have run diagnostic tests on the unit and say that the fans and hardware are fine. They said that there was a problem with the system software. I have reinstalled the system software and booted up from system discs and the machine still makes a noise. I have also tried the fan control programs to try see if I could reduce the noise, but that did not help. Anything else I can try before going back to the service centre and saying they are wrong?