Hey Dave,
The Sony Service guy got in touch and informed that the integrated radeon graphics card needs a change for my laptop be be functional again. This will set me back by a huge amount as the motherboard needs replacement (Rs. 34000 ~450USD).
I am definitely not going to get the motherboard replaced.
Also, is there a way where I can completely disable the GPU on the system and my laptop can function? If yes, what do I lose as far as the screen experience goes? No photos/ videos or no output on the screen at all??