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Black Screen on boot with Nvidia web drivers

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Hi, I installed Sierra 10.12.6 on a pc with these specs;
Dell Optiplex 755
Core 2 Quad Q9400
GT 430 2 GB
8 GB RAM

Everything else seems to work fine(audio, ethernet, etc) but graphics do not work completely. I have to use nv_disable=1 , inject nvidia = 0 in order to get graphics card working but the screen flickers,no graphical acceleration, low resolution(1024x768 instead of 1366x768) and it detects my gpu as 1 GB.
Any help will be appreciated :3

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Try changing SMBIOS to MacPro5,1.

 

Bear in mind that, according to many reports, the GT430 is last supported in Sierra. If you want to upgrade to High Sierra or Mojave, you'll have to replace the card. A low-end GT710 will do perfectly and works OOB.

Edited by Hervé

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Just now, Hervé said:

I think this card has poor to no support under recent versions of macOS. You should consider replacing it by a more recent low-end card such as a GT710. That should work OOB.

1

But with Nvidia web drivers, sierra boots up(audio working,mouse etc) but gives no display :/

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