Laptop not starting


Nov 10, 2016
I have dell insipron laptop of 5000 series.
Intel core i5 5th generation.
Laptop was automatically turned off when it was on and plugged in charging battery was 100% but now when I try to reopen nothing happens.
When I plug in power adapter blinking white flash appears on indicator.
I have tried by removing the battery and reinstalling it and also removing battery disconnect ac source then pressing power button for 30 sec approx then reinstalling battery and tried again but again same happens.
Please let me know why this happens.