HT201295: Reset the System Management Controller (SMC) on your Mac

Learn about Reset the System Management Controller (SMC) on your Mac
western5
Level 1 (0 points)

Q: My Mac pro wont start.  It makes three 1 second beeps about a second apart and repeats evry 5 seconds.   The screen is dark and it attempts to start the inbuilt disk drive but fails.  There is a disc in the drive.  What is going on.

My Mac pro wont start.  It makes three 1 second beeps about a second apart and repeats evry 5 seconds.   The screen is dark and it attempts to start the inbuilt disk drive but fails.  There is a disc in the drive.  What is going on.

MacBook Pro (13-inch Mid 2010), iOS 7.1.2

Posted on Aug 3, 2015 9:13 PM

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western5

Q: My Mac pro wont start.  It makes three 1 second beeps about a second apart and repeats evry 5 seconds.   The screen ... more

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  • by OGELTHORPE,

    OGELTHORPE OGELTHORPE Aug 4, 2015 4:15 AM in response to western5
    Level 9 (52,118 points)
    Mac OS X
    Aug 4, 2015 4:15 AM in response to western5

    Hold the trackpad down when you start up the MBP and see if the disk will be ejected.

     

    There is an issue with the RAM.  Take out the modules and clean the contacts and reinstall them.  Make certain that they are well seated.

     

    If the results are the same, take out one module and test the other one in each slot.  Then swap the modules and test the other one in each slot.  This tests to see if one module or one slot is faulty.

     

    If you have installed new RAM, install the original RAM and test.

     

    If no success, make an appointment at an Apple store genius bar for a FREE evaluation.

     

    Ciao.