When I turn on my. When I turn on my laptop (Acer Aspire 5520) everything turns on fine, but the

Question

When I turn on my laptop (Acer Aspire 5520) everything turns on fine, but the screens compeltely dark or really faint, I hear it may range from a blown bulb, to a inverter problem to wiring problems, but is there anything else that might be causeing it?