Hello. After installing Snow Leopard, I cannot install anything, not even system updates. The installers ignore that i press the "Install" button to authentize me The same happens with the system preference panes which I cant unlock. The installers just don't continue. I've reset all my passwords What could it be? I installed Snow Leopard via external drive, as my ODD doesn't work. Before i had installed 10.5.8, everything worked fine for the last five years (Macbook Pro 2,2). This is driving me crazy Any thoughts? Thanks in advance!