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Question: Macbook Pro during start up will chime, Apple will appear but the load bar indicates that it will only load about 60%, then the screen goes black and the cycle retarts over and over again; HELPP

Macbook Pro during startup will chime, Apple will appear but the load bar show it will only load to about 60% then the screen goes black and the cycle restarts over, and over again. HELP!!!!

Mac Pro, iOS 10.1.1, 15 inch late 2008

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Nov 11, 2017 10:43 AM in response to gsquarejason In response to gsquarejason

Reinstall El Capitan or Later Without Erasing Drive


Please be sure you back up.


  1. Restart the computer. Immediately after the chime hold down the Command and R keys until the Utility Menu appears.
  2. Select Disk Utility and click on the Continue button.
  3. Select the indented (usually, Macintosh HD) volume entry from the side list.
  4. Click on the First Aid icon in the toolbar. Wait until the Done button activates, then click on it.
  5. Quit Disk Utility and return to the Utility Menu.
  6. Select Reinstall OS X and click on the Continue button.
  7. Test to see if the problem is gone.


Also, see this User Tip: Basic Steps for Upgrading OS X.



Nov 11, 2017 10:43 AM

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Nov 11, 2017 10:58 AM in response to gsquarejason In response to gsquarejason

In that case, you will need to erase and install. Important that you have your files backed up.


Install El Capitan or Later from Scratch


Backup if possible before continuing.


  1. Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
  2. Select Disk Utility from the Utility Menu and click on Continue button.
  3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
  4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
  5. Set the Format type to Mac OS Extended (Journaled.)
  6. Click on the Apply button, then wait for the Done button to activate and click on it.
  7. Quit Disk Utility and return to the Utility Menu.
  8. Select Reinstall OS X and click on the Continue button.

Nov 11, 2017 10:58 AM

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Nov 11, 2017 2:57 PM in response to Kappy In response to Kappy

Kappy,


Thank you very much. I was afraid to "erase" as I didn't know if it was also going to erase the data. Perhaps you would know or I may find out for when this "thing" acts up again I will try it. Right now it is working fine but afraid to turn it off. I think it has a cooling problem. The normal internal temps run around 150F and sometimes much higher on full fan speed of 6000 rpm. Thanks again. Jason

Nov 11, 2017 2:57 PM

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Nov 11, 2017 7:47 PM in response to gsquarejason In response to gsquarejason

Clearly, the second procedure does as it says - Erases the drive then installs OS X.


Use Activity Monitor to Kill Runaway Processes


Use Activity Monitor on your Mac

Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity.


Should the above not prove helpful, then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

Nov 11, 2017 7:47 PM

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Question: Macbook Pro during start up will chime, Apple will appear but the load bar indicates that it will only load about 60%, then the screen goes black and the cycle retarts over and over again; HELPP