Dell Inspiron 3521 not starting or not displaying anything

My Dell Inspiron 3521 is not starting suddenly. It won't even load the Dell Logo so I cannot even do Troubleshooting. Even fn+Power button doesn't start the laptop. Although the more troubling issue is that it is showing the LED indicator for on at the bottom, and also shows the charging indicator when I connect the adapter but nothing on the display. Even on long pressing the power button it won't force shutdown. Please guide me how to proceed.