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turn off your laptop take out the battery and hold the power button for 20-60 secs to discharge it and then put the battery back in and reboot or remove the battery and the ram clean the ram or try another stick of ram then press the power button and see if that restores your laptop.
if not plug another monitor into the external vga port, if the external monitor works then your laptop screen is faulty.
if the external monitor is also black or blank then the inverter inside the laptop needs to be checked or replaced.
i would suggest using a spare monitor and connect the cord that would normally go into a computer and connect it to the laptop and then plug in the power cord for the monitor and turn on the computer if this works and everything is ok then you know that the laptop screen may be faulty or there may be a loose connection somewhere ok?
best regards michael