I checked it out yesterday myself. It was starting but the screen wouldnt lit up. I removed the battery and ran on AC power and it worked. Then i again put the battery in, it was still working. I restarted again with the battery only after sometime and it still worked. Today morning he tells me on phone that the screen again was gone so he did wat i did and it worked..lol. He mostly uses the laptop on AC power, so i have changed its power settings. Further, the laptop is an old HCL model which MAYBE doesnt cuts off the voltage completely even when fully charged, and cos of this his battery life now is not even half an hour. Anyways, i have told him to get a new battery.
Thanks guys.