Laptop starts, but screen is black.

I'm going on a trip tommorow so I am in need of a fast response. Last night I was mulling around on my laptop, loading some things on to it. I downloaded Links 2003 demo, and I think i changed the graphic driver. This morning I started up my laptop, and all there is, is a black screen. I can't do anything. Help please!
 
You didn't tell us what the brand/model is, but have you tried toggling the display output?(this would normally be a function key that changes the display from LCD to VGA port, etc... such as the FN+F8 does for Dell machines)
Also, have you tried an external monitor? Does the screen start black, or does it lose picture only after it starts to Boot?
 
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