Authentication Window
I have installed Snow Leopard 4 times now and each time i get too a point that I cannot see the authentication window. First thing first. When i installed it everything was ok, i installed some software and after some time when i wanted to install something using Installer but when i get to the last part where i click install it just blinks that it acknowledge the mouse click but nothing happend (there should be an authentication window for user password but it doesn't show). The same is with locks. There are some locks in different parts of System Preferences (like in accounts) and every time i click on one i get a message authenticating (and again the authentication window should show up) but after a second or two it returns to "Click the lock to make changes.". Anybody had similar problem? It only accrues in Snow Leopard. I have tried an upgrade on Leopard aswell as a Erase and Install no difference.
Aluminium MacBook Late 2008, Mac OS X (10.6)