[Ti] System extension cannot be used

[MB]

Tarik Bilgin said:

>Mach.kext is part of the Core OS. If you play with it, make sure to keep 
>a backup of the old version. I could be wrong but i think this file only 
>gets updated with system patches / installs.
What about Pacifist <www.charlessoft.com>? It has worked great for me in
situations like this with Panther and Tiger. I haven't tried it under
Leopard, but I wouldn't hesitate doing that.