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I have had the well known AMD GPU failure on my 2011 MacBook Pro. Thanks to the instructions of Nimesh Neema, I have successfully disabled the AMD GPU and enabled the onboard Intel GPU. Fantastic!

Next I rebooted my MBP about 6 times, and all was working and normal. When I unplugged the power cable to move the MBP to another location, the screen went black. Touching any keyboard button or the power button, did not reactivate the screen. So I pushed the power button for 4 sec's, waited a bit and then powered the MBP up again.

Unfortunately, immediately after booting when the screen turns on, it showed vibrating horizontal dotted lines all over the screen, as in the attached picture (not the well known grey/pink vertical lines). The booting works normal, logging in works, all applications work. But the screen is terrible with these lines.

Does anyone recognize this?

Is this a malfunction of the Intel GPU?

What can I do? enter image description here

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Does it do this on an external screen? This would show the difference between the GPU being bad or the display going bad. Being you had to hard shut off the laptop I am leaning to GPU being bad.

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    Thnx Thomas! Looking for a Thunderbolt cable to check upon your advice, I also executed reset the SMC. Just to try what happens. Guess what ... After that the system rebooted, not showing any disturbing horinzontal lines anymore. I hope the lines stay away. But I am going to test use the system for a while to see what happens. I'll get back with my findings later.
    – KolfMAKER
    Jul 19 '19 at 10:31
  • Glad that seems to have fixed it. Let us know how it goes. Jul 20 '19 at 4:08
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    Now a few days later, the system still works fine. Sometimes I notice that when the screen changes from login screen to user desktop, the display shows the change between two screens in bands. Apart from that, no problems. I guess the SMC-reset did the trick.
    – KolfMAKER
    Jul 21 '19 at 6:39

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