My laptop is not turning on....

Hello,
i turned my laptop on and as soon as i put my password the laptop went off!! !its not starting again....when i tried to charge it its not even charging...the led light on the charger turns on when i insert in the mains supply but as soon as i put it in the laptop the led light goes off....my laptop is completely dead rght now...what should i do???i tried removing the battery and holding it for 30 sec..but its still not working... please help!!!!...any help would be appreciated...