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Where do I start troubleshooting when my Mac freezes on startup?

Startup Freezes - First Step

The point in time at which a startup freeze occurs can help you diagnose the problem. Here are some general rules of thumb:

Freezes when starting up, before the extensions load -- probably a hardware problem.
Freezes when starting up, during extension loading -- probably a bad extension or extension conflict.
Freezes after extensions load, when the Finder starts -- probably a Desktop or Finder problem.

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