It comes on but I can't see!

My laptop was dropped. It powers on and goes through loading os. The screen remains slightly white. Plugged into an external monitor and only the "windows xp slpash/load screen"shows and then the monitor loses the signal. I know it has loaded "cause that familiar "start windows song" plays. I can even use the keyboard to shut the laptop down. What will I have to replace? Should I take the whole thing apart? Has anyone ever experience this white screen issue with a Toshiba laptop?
I'm looking for anyone with specific experience simply because I have replaced laptop parts before. I've read about the fl inverter and need to know is it that? Is it the lcd? Is it the motherboard? The unit is out of warranty therefore Toshiba will not be fixing this. I've reseated the 'data flex' cable, memory, hard drive.