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System won't BOOT, black screen!

HDD CPU GPU Black screen BOOT problem

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I have a hard time understanding what's happening with my Laptop (N56VZ)!. After I did a format with an 
external hard drive (Win10) and finished process successfully. I finally restarted and entered BIOS menu to set it up to default setting in order to boot from regular order!. After I hit save settings my computer didn't start anymore.
when I press power button I see keyboard light to turn on. Then HDD Led runs for 2 sec and turns off instantly and I can see only a black screen.
P.S I tried to swipe RAM modules HDD removed and put a new one! but same result!
Please help!, what might be the main problem(s) causing this situation?

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    Mechanised Mod

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:welcome:   uljan1,


Are you still able to access the BIOS.


Does the power or battery charging LED light up when the AC adaptor is connected to the notebook.




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