MacBook Pro 15" 17" Models A1151 A1212 A1229 and A1261, are well know with GPU issues, turn on no display. internal or external. No water damage? Did you try different ram? no beeps ? original owner? , you can try to flux GPU on the logic board with heat gun, lots methods, some bake the logic board at 90 c. ect. Not permanent fix , I fixed my friend macbook pro 15" with clear flux 6 months ago still working.
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