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.