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Hi. try accessing the Start-up BIOS features by pressing F2 or Delete key when you see the Toshiba logo. Check for the Tab that will give you the control for the brightness/contrast of the screen. If that doesn't do anything then most probably the backlight (LED or CFL) must have been busted. and needs replacement.
if the fan is not running continuously then its the fan ans board problem.because the board is getting hot and fan is not running so the board is getting overheated and the machine is nor working.and if the power light is ON and fan is running but only the screen is black/blank then its the problem of inverterboard.the cost of new board is $25 get it replaced fromn near by laptop repair center.