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What Is The Gray Progress Bar That Shows During Startup?

Question:

Sometimes when I turn my computer on there is a gray progress bar below the Apple logo. Why is it showing up during startup?
- Asked by Pedro B. September 26th, 2011

Answer:

The gray progress bar will sometimes appearing during startup or after waking up a Mac from sleep. If you are seeing it during startup, your Mac is probably attempting to reconcile a problem with your hard disk. If this happens repeatedly, you should make sure to backup your hard drive with Time Machine and then use Disk Utility in the OS X Installer to verify and repair your hard drive.

The gray progress sometimes appears when you wake from sleep because your laptop battery is nearly dead. This is completely normal.

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