Chosen Solution

Since Apple very conveniently stopped making parts for my MacBook Pro (late 2011), does anyone know where else I could try to purchase another graphics card?

The dual graphics GPU on the MacBook Pro 2011 15” can be permanently disabled or treated with a software fix. Here’s a video on doing it permanently https://www.youtube.com/watch?v=vbXb0gfR… Here’s the software fix which I have used on about a dozen machines now to get them back to functionality: gfx card status https://gfx.io

The MacBook Pro’s don’t have serviceable graphics card. You’ll need a new logic board if the graphics died. How about telling us a bit more on what you have encountered so we can be sure the logic board is the issue.