I was surfing the net using my Dell Inspiron 1501 laptop when suddenly the screen went black. No Fan noise . Completely dead. I tried everything I knew - disconnected/reconnected the AC adapter, took out and again put in the battery. But nothing works.The power on indicator light does not light up when I press the power button. The green light on the AC adapter glows when I connect it to a wall socket but dims or goes off when I plug into the laptop power socket. what is wrong? what is the solution ? Can somebody advise me?