I see, thanks! For now I found whole 2012 model mentioned as broken/for parts for 80usd. I wonder what could happen and maybe mb is alive. Will think if I wanna step into it.
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MBP 1,1-10,2 Force 2011 MacBook Pro 8,2 with failed AMD GPU to ALWAYS use Intel integrated GPU (EFI variable fix)
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Hello! I don't understand even half of what you write here, but I also have an old Mac Book pro 17"... I can't figure out what's the matter, in general: white screen when turning on, after a few weeks I learned to turn it on: hold "Shift + Ctrl + alt + power button" for 10-15 seconds, then release only Ctrl + alt and then quickly press the start button again. (this does not always work, but I'm stubborn and repeat ....) And when it starts making a special noise, this is a sign that it will start 
then a purple screen appears, then it can be red, then my account, if everything is ok, sometimes a black screen, which I close and when I open it, the account appears. And so it works, however, only for reading safari and youtube. And yes, the keyboard / backlight in all these experiments also stopped glowing, but not so long ago, I think he is immortal, I feel sorry for him, and he is dear to me, it's a pity that he got old, I love it. I'll finally buy a new one, but I haven't decided on a model yet, so I'm reading the forum and came across this thread. (I'm writing with a translator, if anything)
then a purple screen appears, then it can be red, then my account, if everything is ok, sometimes a black screen, which I close and when I open it, the account appears. And so it works, however, only for reading safari and youtube. And yes, the keyboard / backlight in all these experiments also stopped glowing, but not so long ago, I think he is immortal, I feel sorry for him, and he is dear to me, it's a pity that he got old, I love it. I'll finally buy a new one, but I haven't decided on a model yet, so I'm reading the forum and came across this thread. (I'm writing with a translator, if anything)Attachments
Just boot a Linux DVD. It will boot to a live session. Does not install unless you tell it to. If your machine is 32bit efi you will need to get a Matt Gradient one. If it runs, Your machine is good. Just reinstall latest apple that works for your computer (not the newest, just the last one for yours)
I was given a 2010 iMac that would only boot to a gray screen. The owner had tried to install a newer mac OS too new for it. I was told the AMD GPU was bad from this Forum. I booted linux and everything worked. MacRumors then said that Linux was using the CPU to run Graphics. NOT TRUE. I then Installed the latest Mac OS that would run on the imac over the internet. Everything worked. That proved the AMD GPU was good because if it was not, the iMac would only boot to a gray screen.
I was given a 2010 iMac that would only boot to a gray screen. The owner had tried to install a newer mac OS too new for it. I was told the AMD GPU was bad from this Forum. I booted linux and everything worked. MacRumors then said that Linux was using the CPU to run Graphics. NOT TRUE. I then Installed the latest Mac OS that would run on the imac over the internet. Everything worked. That proved the AMD GPU was good because if it was not, the iMac would only boot to a gray screen.