Habe ich vom Sonnet Support bekommen, und es hat mir geholfen. [Zitat] You might try this trick and see if it helps. Boot from that other disk you mentioned and follow the directions below. I got this from the MacFixit.com website. Delete kernel extension caches, other caches for some issues A number of common issues that crop up after incremental Mac OS X updates can be resolved by deleting specific cache files -- specifically kernel extension caches -- and restarting. This can most easily be accomplished with a shareware utility like Tiger Cache Cleaner, but also bears a manual process that involves dragging the following files to the trash: • com.apple.kernelcaches (a folder in /System/Library/Caches) • Extensions.kextcache (a file in /System/Library) • Extensions.mkext (a file in /System/Library/) • com.apple.ATS (a folder in /Library/Caches/) • Files that start with com.apple.LaunchServices (in /Library/Caches) You will be prompted to enter your administrator password when dragging these files to the trash. You may need to restart after moving them to the trash. Re-apply the Mac OS X 10.4.2 combo updater A workaround that has proved successful for various problems caused by previous incremental Mac OS X updaters is re-application of the current combination updater. Doing so overwrites potentially problem-causing files that were not replaced by the "Delta" (adjacent version-to-version) update available through Software Update or as a standalone download. [/Zitat] Hoffe das hilft auch dem ein oder anderem von euch.