Sony Vaio VGN-NR240E laptop. The battery died and the computer wouldn't start. I had read somewhere that you cold remove the battery and the power cord, hold the power button for about 30 seconds and then plug the power cord in and the computer would release "residual energy" and would boot. This worked for a while but now I get two lights to come on briefly and then they go off and no Windows boot. If I make another attempt to power it up without first removing the power cord and holding the start button nothing happens. After holding the power button and then plugging the cord back in I will again get the two lights. I have tried two different power cords with the same result. Please advise.