Reset the Power Managements system. Turn computer off/ next power on the computer and ASP hold down the "P, R, OPTION and Command" keys all at the same time. Keep holding until you hear the computer chime at least three times. If the computer will still not boot to the hard drive, you amy have a bad hard drive or one that has no Operating system installed on it.
Go into system preferences and goto startup disk and click on Mac OS X 10.X.X
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