hold down the 'Fn' button along with the right or left arrows, right makes it lighter & left makes it darker.
Computer Wiz
January 2010
Sounds like the screen inverter board is on the way out...common problem with laptops..inverters for all brands of laptops can be had cheaply on ebay...once you have the board take it to a repair shop...should not be too costly to fix.
Mike
December 2009
Automatic Answer
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Try fixfault.com to fix notebooks/laptop pcs.