If refresh rate/driver update won't help, that is the hardware problem which could be:
the connection between the LCD and the graphics card;
the LCD itself is broken;
the graphics card is broken.
EDIT:
Is the flickering like this?
[youtube]http://www.youtube.com/watch?v=eBtqXO1HSDU[/youtube]
If so, that probably is a hardware problem. But try changing the refresh rate/update the driver
Last edited by The_Physicist on April 27, 2011, 11:48 pm, edited 2 times in total.
It may be the connection between the LCD and the graphics card, it may be the LCD itself or the graphics card.
Try partially opening your laptop, see if it stops the flicker (the connection);
Change the LCD;
Change the graphics card.