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Macbook Pro fails to reboot or turn on after installing Mountain Lion, worked perfectly before hand

2490 Views 6 Replies Latest reply: Sep 25, 2012 12:29 PM by Skymuscle83 RSS
Baaron01 Calculating status...
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Jul 30, 2012 8:12 AM

Last night I ran software update, installed updates, and ran a full system virus scan, which all worked perfectly. I then downloaded and installed OS X Mountain Lion, and upon finishing the install, my macbook began to reboot. However, it fails to do this time and time again and I am now left with a non functioning computer.


It will simply reboot, get stuck on the apple launch screen, sometimes make it all the way to the initial stages of my desktop, and then reboot itself. It then displays a message saying that the computer was forced to restart because of a problem, and then repeats the entire process. This has happened close to 20 times with no change. Have hard rebooted several times but still no luck.


Any suggestions?

MacBook Pro (13-inch Mid 2010), OS X Mountain Lion
  • Mini-Mac Level 3 Level 3 (780 points)

    Heard rummors that Virus Barrier could cause a problem with the install of ML (hopefully you have a backup!)


    What you could try:


    1.  Reboot holding down the Option key, Until your disk and the revovery disk appears.

    2.  Start recovery partition

    3.  In recovery partition, select Disk Utility and repair Disk (Macintosh HD or what ever it named), (repair disk 3 times if possible waiting 15 seconds between each repair)

    4.  Restart your Mac.


    If the above don't work, reinstall ML from within recovery partition.


    If reinstall works:


    1  Repair permissions (twice) after your computer has restarted

    2. Repair Disk like from above #3 (repair disk 3 times waiting 15 seconds between each repair).

    3. Restart computer and repair permissions once more.

    4. Go to System Preferences, select StartUp Disk and make sure it's highlighted blue (selected) then your done.  If it's not selected, select it and restart.

    5. Done


    Good luck, hope you have a good solid backup!

  • Mini-Mac Level 3 Level 3 (780 points)

    Holding down the Option key during boot (before the bong sound) will get you to both the (a) Startup Disk which is the Macintosh HD and (b) Recovery Partition.  As soon as the computer starts up hold down the Option key until the first bong sound, startup the Revovery Partition NOT Macintosh HD and do a Disk Repair by opening up Disk Utility in RP..


    If you have 10.8 installed and a Recovery Partition (RP) you CAN reinstall ML from the RP and an internet connection.

  • Mini-Mac Level 3 Level 3 (780 points)

    What a pickle!!!!!


    Looks like your only option is to download ML, erase you drive and reinstall ML.  ONLY if you put ML on a UBS thumb drive before installing ML the first time.  Then you could boot from the USB drive and reinstall ML. 


    I take it you didn't do that the first time around? 


    #1  If not you'll have to reinstall the OS version prior to ML (Lion).  You should secure erase the drive using this option.  


    Here's how to make a ML install USB:  Note: if you choose the disk method you'll need a double layer DVD.



    • TRY this first if you have a solid backup of you data.

    Boot into you Recovery Partition, open Disk Utility and erase (do NOT secure erase) your Macintosh HD. 

    After erase finishes rename the drive (Macintosh HD), then repair disk 3 times in a row. 

    If all comes back OK. 

    Start the ML install again. 

    If this doesn't work then you'll have to use above #1 method.


    NOT sure if this will work.......proceed with caution!!!!!!!!!!

  • Skymuscle83 Calculating status...

    I just downloaded and installed Mountain Lion and I'm running into the same exact problem!!  I've tried all of what has been suggested and absolutely none of them worked.  I tried them before I came here.  Try holding down the shift key until a little bar comes up on the bottom of your screen.  It's booting your mac in safe mode.  this is the only way I can get my mac to boot.  My macbook pro was running flawlessly with lion on it so I'm redownloading Lion and putting it back on there.  I can't believe Apple would allow this horrible product on the market!! 


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