Updated to snow leopard and now get a black screen and cursor. Boot up in safe mode fine. Booted up Command S, mounted the files system as writable then removed the following files: rm /Library/Preferences/com.apple.loginwindow.plist rm /Library/Preferences/loginwindow.plist rm /private/var/db/.AppleUpgrade Still black screen. booted in SM and performed apple updates. Still black screen. ran a disk check all fine. Removed ram and swap. still black. What am I missing here? An help is greatly appreciated.