OK, my girlfriend's laptop just suddenly shutdown with no warning. The screen went black first and then the power on lights turned off. It was fully charged (plugged in to the wall), no weird hard drive noises, no blue screen of death or anything. It just simply doesn't turn on. We thought it was the battery, so we purchased a new one but that didn't help at all. But one weird thing is that when you plug in the cord for charging the computer into the wall socket, then into the computer (turned off completely/dead), I can hear a little clicking noise. Very feint. Any ideas on what I should be looking for?