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Could be the screen went bad or the graphics went bad. &nbsp;To check connect the laptop to an external monitor if you don't see video then reboot. &nbsp;<br />
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If you see video, then the laptop screen may be bad or its possible, on many laptops, that the video mode is set to external only. &nbsp;Check the function key icons for a rectangle with a line on each side. &nbsp;This key (while holding down the function button) will toggle video output modes -- usually between external only, internal only and both.
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Could be the screen went bad or the graphics went bad.  To check connect the laptop to an external monitor if you don't see video then reboot.  

If you see video, then the laptop screen may be bad or its possible, on many laptops, that the video mode is set to external only.  Check the function key icons for a rectangle with a line on each side.  This key (while holding down the function button) will toggle video output modes -- usually between external only, internal only and both.

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first i &nbsp;run my lap without hdd and it shows some error then i insert my hdd my lap gets off and open normally
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first i  run my lap without hdd and it shows some error then i insert my hdd my lap gets off and open normally

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when you push the power button - do you see any display at all ?
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when you push the power button - do you see any display at all ?

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When i turn on my laptop the screen stays black. I can hear the fan running and the charger light is on, so why isn't it turning on correctly?
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When i turn on my laptop the screen stays black. I can hear the fan running and the charger light is on, so why isn't it turning on correctly?

display not working

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.