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sounds like a bad screen this might be able to be remedied by hooking the laptop straight to a computer monitor threw the ports provided in the back
also you could have bumped something loose inside like a video card if any cards or memmory comes loose this will give you black screen of death the laptop will have to opened and cards pressed down gently
theres the solution of your power supply on the laptop went out and you need a replacement
if power supply went out it doesnt hurt your comp it just makes it hard to run
you could try booting on battery instead of mains and see what happens, also could the screen be switched off ? If you have access to another monitor, you could try plugging it in to see if the video output is ok. ( some laptops have a facility to switch off the screen display for security etc )
Most laptops have a video connector that you can use to connect you laptop to an external monitor. connect an external monitor to your laptop and see if anythig comes up on the external monitor.Your laptop has a key to switch between it's own screen and the external monitor.When you use the external monitor ,you'll have to use this key to switch to the monitor.Your battery should'nt matter if the laptop is running on AC.Let me know what happens and we'll go from there.