I am really interested in if this problem has been resolved as I have been having the same problem. I am relatively sure that this is a software problem and not a hardware one as the clicking sound started AFTER I had been fiddling around with some Toshiba settings.
Did you try the suggestion about disabling the Toshiba PC Heath Monitor Software?
I am still testing a solution as I think this may have been something to do with an AutoPlay setting (my mobile dongle kept coming up on boot). I have changed the settings so that my broadband just logs on automatically and so far no extra clicking.
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