My Laptop has not had a working lcd screen for about 3 weeks now but I have still been using it through my television display. When I press the Function and F8 keys at the same time my screen will flicker on for a second then go back off. I am going to take it apart and look for what the problem could be. I have a newer laptop and an external with everything backed up. Where should I be looking for the problem? could It be a simple loose wire or what could it be?