Macbook Pro Blackout

Hi Friends,

I am a long time user of apples products.. Have almost all of them but right now I am in big issue.

My 15' pro (Yosemite 10.10.3) was working till last night when I switched off normally. From today morning, I can hear chime but all I could see is black screen. My sleep LED works normally indicting no issue with display drivers.

I tried to do NVRAM / PRAM reset.. it is not working (can't hear 2 distinct chimes). My Normal Shift + Power reset is also not working. Also , Shift + ctrl + option + Power is not responding anything.. All is all.. all reseting options is failed.

I am pretty sure its nasty apple automatic update that has kicked this last night.

Can any of you help me.. as I don't have apple care.. I am on the verge to throw this **** costliest pro in current market.