Refer to owner guide or downlowd from here: http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp?nav=Product%20Support
Hi
somewhere on the laptop key board should be 2 keys with lights on them one for brighter and one for dimmer it you hold down the FN key as well as pressing the brightness key it should become brighter
hope this helps
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