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B.5. Startup Problems

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B.5. Startup Problems Not every problem you encounter is related to running applications. Sometimes trouble strikes before you even get that far. The following are examples. | B.5. Startup Problems Not every problem you encounter is related to running applications. Sometimes trouble strikes before you even get that far. The following are examples. B.5.1. Kernel Panic When you see the cheerful multilingual dialog box shown in Figure B-2 you ve got yourself akernel panic a Unix nervous breakdown. In such situations user panic might be the more applicable term but that s programmers for you. If you experience a kernel panic it s almost always the result of a hardwareglitch most often a bad memory RAM board but possibly an accelerator card graphics card SCSI gadget or USB hub that Mac OS X doesn t like. A poorly seated AirPort card can bring on a kernel panic too and so can a bad USB or FireWire cable. If simply restarting the machine doesn t help detach every shred of gear that didn t come from Apple. Restore these components to the Mac one at a time until you find out which one was causing Mac OS X s bad hair day. If you re able to pinpoint the culprit seek its manufacturer or its Web site on a quest for updated drivers or at least try to find out for sure whether the add-on is compatible with Mac OS X. Tip This advice goes for your Macintosh itself. Apple periodically updates the Mac s own drivers in the form of a firmware update. You download these updates from the Support area of Apple s Web site if indeed Mac OS X s own Software Update mechanism doesn t alert you to their existence . There s one other cause for kernel panics by the way and that s moving renaming or changing the access permissions for Mac OS X s essential system files and folders the Applications or System folder for example. See Chapter 12 for more on permissions. This cause isn t even worth mentioning of course because nobody would be that foolish. B.5.2. Safe Mode Safe Boot In times of troubleshooting Mac OS 9 fans used to press the Shift key at startup to turn off the extensions. Windows fans press an F-key to start up in Safe Mode. Either way the idea is the same .