BLANK screen! Backlight OK, external OK. Sometimes(randomly) works?

Hi all, I've been browsing these forums a bit, any help/tips are appreciated in advance.

Symptoms:

- Blank/BLACK Screen (normally doesn't display images on laptop screen)

- Backlight works (lights up, but all "black."

*Display changes in brightness by using the dimmer/brighter keys (goes from blacker black, to "brighter" black/greyish color.

- Displays images on external monitor without problem.

- SOMETIMES, the laptop screen displays PERFECTLY (all of the sudden, as if resurrected. But then, like a ghost, it is gone, as if I was just imagining it (If I shut it?/adjust screen angle?)

Possible cause

It fell out of my bag when I slipped on some ice running late to work. (Apple care says "sorry, we can fix that for $600-700)

Could it be that there is a connection that is simply loose/damaged? Because it SOMETIMES works. perfectly.

Some ideas i've noticed on this site (but I don't really know how to interpret/evaluate them further, as I am not a computer whiz)

- Logic board connection

- display data cable?

- LCD or display data cable OR inverter?

- Cable that connects LCD to motherBoard?

- Inverter Cable?

- LCD panel?

Any advice on how to proceed/what tools I would need? I'm a college kid, struggling without it! Thanks in advance!)

(My computer) =

MacBook, 13"

(aluminum casing)

~2008? (one of the first ones just introduced)

Katrina