my brother just went to college with a macbook.. i have an imac without an isight.. We have used video conferencing when he was home, and it was fine.. and even video conferenced with friends at other colleges.. But now we are trying to do a one way video conference.. and it wont connect, i get an error.. why is this happening? I want to get an isight on my computer, but dont want one if i cant get it to connect with him..