Laptop turn off

i received a hp dv5230us lap from my friend. when it power on by using power switch, suddenly turn it off & power LED is also shut down.. adapter & battery are OK.. I reseated ram & hard drive. but didn't work for me. your kind help?????
thank you....
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More about laptop turn
  1. what kind of blinking. how many blinks. it could be an error code that could help us determine what the issue is.
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