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It sounds like a fault to its power transition section circuit. Actually, this circuit is built inside the mother board to your laptop.
Please contact the authorized service center, and describe and show them the problem you do experience now, with your laptop. It can be rectified. Gopakumar Gopalan Google
I have the same problem! I received a response to my email telling me to disconnect adapter and battery, hold the power button 30 minutes, connect ac (make sure it's plugged), turn on, wait 1-7 minutes, then attach battery after windows boots. After several tries, it still hasn't worked. When I turn on the system, my power led stays green, but the hdd indicator is not lit. My battery can still recharge, but the screen is still black, and there is no sound.
check the light on the power supply that you are hooked up to. before you plug it into the laptop see if there is a green light when the plug has power from the wall. if you see a green light on...good. it means the power supply is responding correctly so far. if you get no green light, then your transformer is out in the psu. if you get a green light and plug in to the laptop and the light goes out, one of two things could be going on. first there could be a short in the psu like the previous tech said, the second more serious issue could be the power controller on the motherboard. they've been known to go out. like the tech before said. try another power supply if you can. but if you are getting a green light on the power supply before you plug it in...there may be another problem with it.
After replug the graphic card and switch on the pc & install back the graphic ... The power button remains green but the screen is black. ... From what i have noticed there is probably some issue with the thermal cutout ... Lights light up, Drive sounds as if working,