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I have a 2006 Macbook Pro with Snow Leopard as the OS X and I recently purchased OS X 10.7 from the App Store. After download, I began the installation of Lion, it restarted and just remained at the grayish window with the black apple and the black pinwheel. I left it alone, but after hours, just remained there, no progress

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  • Start in Single user mode to see what is happening line by line. support.apple.com/kb/HT1492
    – Ruskes
    Commented Sep 7, 2014 at 16:28
  • I'd recommend verbose mode instead as the actual boot procedure will be unaffected. —cc @Buscar
    – grg ♦
    Commented Sep 7, 2014 at 16:33
  • try creating the installer using a USB: lifewire.com/…
    – Racing121
    Commented Jul 30, 2017 at 14:35

1 Answer 1

Reset to default
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Here are some things you can do (short of reinstalling the OS)

  • Start in Verbose mode (cc George)

  • Start with cmd-r using the disk utility to repair disk permissions

  • Start in Safe mode (hold Shift) to see if non OS apps are doing that.

  • Reset your SMC

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