Isight problems MacBook

My Isight just turns on at boot and the only way I can turn it off is to restart the computer (and even that doesn't take care of the problem). So far I haven't been able to find much info on this issue except this thread (link; link2) which doesn't prove to be much of a help anyways. Despite the fact that I am not employing the webcam almost at all, would be nice to have a functional one in case I decide to use Skype or something similar. Any suggestions?