My fairly old Sony Vaio PCG-FXA47, will not power on. If i press the power button, nothing happens on the screen, but the power lights go on, only until i take my finger off it. The screen stays pitch black, and no fans go on, etc, it doesnt turn on. Also, I charged it all night, and still the same problem. Please help, what can possibly be wrong with it? How do I fix it? Suggestions?