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Q: Blank Screen of death, once in a while

It first happened a couple of weeks ago.  While working, I get a blank screen.  No more mouse.  Nothing happens when I move the mouse or enter a key.

 

I don't remember exactly what happened, but here is a rough recollection of what happened:

I usually use an external HD monitor with the Mac lid closed.  So, I open the Mac lid and hold power button down until Mac turns off.  I press the power button.  Mac starts up with logo.  The progress bar progresses a little.  Then it shows a blank screen.  I power off and power on.  Then it shows "Your system restarted...press any key or wait a few seconds..."  (I don't remember exactly this message.)  I press a key and the boot up resumes.  Then it shows a blank screen.  I power off and power on. Then I get a blank screen.  I power off and power on.  Then it boots up correctly.

 

The Mac worked fine until yesterday.  While working, I get a blank screen (I think it was gray).  No more mouse.  Nothing happens when I move the mouse or enter a key.  After a while the fan speeds up to high speed.  I power off and power on.  Mac starts up with logo.  Then it shows a blank screen.  I power off and power on.  Then it shows a blank screen.  After a while, the fan will speed up.  I power off and power on. Then I get a blank screen.  I power off and power on.  Then it boots up correctly.

 

So far, my Mac is still working.  What is causing this?  How do I fix it?

 

I switched over from Firefox to Safari 9.1.1 about a month ago.  Is Safari doing this?

 

My system:

MacBook Pro (15-inch, Early 2011)

OS X 10.10.5

Processor:  2.2 GBz Intel Core i7

Memory:  8 GB 1333 MHz DDR3

Graphics:  AMD Radeon HD 6750M 1024 MB

512 GB SSD

Mac Pro, OS X Yosemite (10.10.5), 15-inch, Early 2011, 2.2GHz Core i7

Posted on Sep 8, 2016 7:46 AM

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Q: Blank Screen of death, once in a while

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