Macbook (white) - black display, but works fine on external display.

Hi everyone!
Today, when I woke up, my Macbook wouldn't wake up from sleep-mode. Or, it did, but the display didn't.
I tried all the tricks on here: http://www.neilturner.me.uk/2009/01/18/fixing_your_macbook_scree.html but nothing seemed to work.
The strange thing is that the Macbook works perfectly on my external display. Sometimes, when I turn down the brightness all the way down and up again, the display will work fine for 2-3 seconds, then turn black again.
If I use a flashlight I can see the desktop on my display, but it's really, really dark.
I bought this machine in late 2008 and everything has been working perfectly until this day. What should I do? I even upgraded to Lion, to see if that could help, but it didn't.
I just can't afford a new machine right now, so any help would be hot!
Thank you guys so much!
Zorlee

Ah. I'm not able to run the hardware test because it only works on the main screen. There's no obvious way to switch to an external monitor when AHT is running, which is ridiculous if the hardware fault concerns the screen! The problem isn't with the backlight - there is no dimmed image on the screen, it is just off.
I'll just have to use it with an external monitor, I guess - which defeats the purpose of buying an iMac!
Thanks for your help, though.

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