I recommend you to try checking with your adapter and external power source.
If the laptop turns on but the screen is blank or no display, then the issue can be even due to corrupted display drivers.
If the laptop does not boot at all, then issue mught be due to battery, hard disk, etc.
I recommend you try the steps in the below link:
http://notebook-solutions.blogspot.com/2009/05/notebook-solutions-notebook-solutions.html
Follow the steps from No power or no boot in laptops.
Also try if you can boot into safe mode.
If you can boot into safe mode, perform recovery so that your laptop may turn on.
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