Help Guys macbook pro won't turn on

[Gideondee]

Hey guys,
Sorry English is my second language so am jot very good atbit.

I have a Macbook pro late 2011 the battery ws swollen which made the trackpad unusable so I had to change the battery. After I bought a new battery and replaced it with the old one, everything worked just fine. But after two days of using it suddenly shut itself down i tried to turn it on and when the apple logo appears some strange, weird horizontal lines appeared on my screen and it went off again.

Now when I turn it on, the fans are working the light too but nothing shows.

I have tried SMC Reset, NVRAM reset no luck.

I have tried to put back the old battery, no luck.

Disconnected the logic board, no luck.

What could be the issue?

 

[Fishrrman]

What SIZE is the display?
Is it 15" or 17"?

If so... then you have "RadeonGate" (GPU failure).

You need to research it and read up about it.

There's really "no fix" other than to disable the discrete GPU and run with the integrated GPU.

See this thread (it's a LONG ONE):

Force 2011 MacBook Pro 8,2 with failed AMD GPU to ALWAYS use Intel integrated GPU (EFI variable fix)

If you don't have time to read my story (which also describes some interesting technical approaches) just scroll down this thread until a "100% WORKING SOLUTION" text Discrete AMD GPU of my 2011 MacBook Pro 8,2 has finally failed because of the reasons mentioned here (...

forums.macrumors.com

Not worth spending money on at this point.