Re: Laptop screen
Not an expert on LCD repairs, though I've had some success/luck. I would just advise checking/reseating the connections, especially the connections for the inverter board (that long, thin board just under the screen).
The successful repairs I have done (~3x) have all involved replacing the inverter board along with the bulbs. That said, I've not done this repair on laptops...mine were (believe it or not) ATM machine screens (new screens were $1400 and I could repair the existing screen for $200 in parts).