Color bar line at startup, and then black screen, then startup is very well

macOS Sierra - macOS 10.12 Beta (16A294a)

MacBook Pro (15 inch, early 2011)

2.2 GHz MacBook Pro (MC723LL/A)

Intel Core i7

Intel HD Graphics 3000 - 512 MB and AMD Radeon HD 6750 M (1024 MB) with automatic switching

Processor: 2.2GHz

16GB 1333 MHz DDR3 memory

Boot disk: 1 TB - Samsung 850 SSD

Graphics - graphics Intel HD 3000 512 MB & AMD Radeon HD 6750 M - 1024 MB

Here is the situation - when I initially push the power button - the display lights up, come up apple logo, bar starts to fill in through the screen start and the point 1/2 way, I get a strange color line (Fig 1).

Then the screen goes black for a second or 2 (photo 2).

Then start bar turns and ends. (photo 3)

Then I can connect.  (photo 4).

Other that the newspaper in question, it doesn't seem to be any other question.  Systems has passed Diagnostics.  I have reset NVRAM & MSC.

Anyone know what is happening?

Any help is appreciated.  I bought the MBP, used from a seller on Amazon.

Thank you.

Thank you.

I had this problem too, but it resolved now on the Apple store. They had seen previously on older hardware which has been updated for Sierra with FireVault market and occurs when the operating system is switching graphics modes. I got just my logic board replaced so wanted it is solved.

We have attempted to extinguish FireVault, but the question was still there. Then they have successfully installed a new copy of a Mavericks and the problem was gone. Then they installed a new copy of Sierra and the question is still missing. Now, I have re-enabled FireVault and the issue has gone.

Tags: Notebooks

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