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I have a MacBook Pro on OS 10.6.8 I have tried to upgrade to the current OS. The download appears to work fine, but when I select restart to install, the Mac starts to shut down, then just hangs.

I can only start the Mac again by holding down the on/off switch to turn off, and then turning on again.

What is the solution?

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Do you have the required hardware for the system you want to run? Here is a list of requirements, I shamelessly copied these from support.apple.com

OS X 10.6 Snow Leopard system requirements

To install Snow Leopard for the first time, you must have a Mac with:

  • An Intel processor
  • An internal or external DVD drive, or DVD or CD Sharing
  • At least 1 GB of RAM (additional RAM is recommended)
  • A built-in display or a display connected to an Apple-supplied video card supported by your computer
  • At least 5 GB of disk space available, or 7 GB of disk space if you install the developer tools

OS X 10.7 Lion system requirements

To use Lion, make sure your computer has the following:

  • An Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
  • Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended)
  • 7 GB of available disk space
  • 2 GB of RAM

OS X 10.8 Mountin Lion system requirements

To install Mountain Lion, you need one of these Macs:

  • iMac (Mid 2007 or newer)
  • MacBook (Late 2008 Aluminum, or Early 2009 or newer)
  • MacBook Pro (Mid/Late 2007 or newer)
  • MacBook Air (Late 2008 or newer)
  • Mac mini (Early 2009 or newer)
  • Mac Pro (Early 2008 or newer)
  • Xserve (Early 2009)

Your Mac needs:

  • OS X v10.6.8 or OS X Lion already installed
  • 2 GB or more of memory
  • 8 GB or more of available space

OS X 10.9 Mavericks system requirements

To install Mavericks, you need one of these Macs:

  • iMac (Mid-2007 or later)
  • MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
  • MacBook Pro (13-inch, Mid-2009 or later),
  • MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
  • MacBook Air (Late 2008 or later)
  • Mac mini (Early 2009 or later)
  • Mac Pro (Early 2008 or later)
  • Xserve (Early 2009)

Your Mac also needs:

  • OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
  • 2 GB or more of memory
  • 8 GB or more of available space

OS X 10.10 Yosemite system requirements

Before you install Yosemite, make sure you have one of these Macs:

  • iMac (Mid-2007 or newer)
  • MacBook (Late 2008 Aluminum, or Early 2009 or newer)
  • MacBook Pro (Mid/Late 2007 or newer)
  • MacBook Air (Late 2008 or newer)
  • Mac mini (Early 2009 or newer)
  • Mac Pro (Early 2008 or newer)
  • Xserve (Early 2009)

Your Mac also needs:

  • OS X Mavericks, Mountain Lion, Lion, or Snow Leopard v10.6.8, already installed
  • 2 GB or more of memory
  • 8 GB or more of available disk space
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