Macbook Screen Dim (most the time)

Hi I'm having a problem and was hoping someone could help...

My screen on my macbook pro (late 2007) has been running dim for a while now.

It's not unusable, just so dim that its stressful to use.

Ambient lighting is not on. And I know how to turn up the screen brightness.

It seem like the backlight might be gone. At a guess.

Sometimes it flickers back on, and the computer runs at its old full brightness.

But if I turn the screen down, or it goes to sleep, or I turn it off, whatever, when I turn it back up/on the brightness (possibly backlight) is out again.

It's really frustrating.

So Im thinking either a wire might be loose (my great hope) or there is an issue with one of the chips.

I would have a go at fixing it if I knew what the issue likely was.

Any ideas?

Thanks heaps!

E