Don't know what threat means

my toshiba satellite will not come on, cd works, but screen is black. anything obvious to everyone but me? ARe there hot key combinations that will reset everything?
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More about threat means
  1. Possibly the monitor is broken? try plugging it into an external monitor.

    Does the computer actually power on as if it was working? if not then the laptop may be completly gone
  2. Often the lamp fails.

    Try shining a flashlight onto the screen, at an angle, see if the display is there but there is no backlight.
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