Hi, I have a dual processor MacBook which is causing me some grief of late .. When I start up the screen goes black - the arrow is still visible, the volume and brightness buttons respond (well the volume button beeps away). It feels as if the login screen is there, just not visible. Starting in Safe Mode I can get everything working as normal, it's just the normal startup. I have tried using the disk utility from the install cd to repair and verify the hard disk. I have also tried looking for startup items with each user (there is currently no StartUp folder in Library for each of 2 users). I have also removed the items in the login tab of the individual accounts. How do I get this machine running properly again? Can anyone please help?? Thanks.