Unhappy [Q] Karbonn a9+ wont turn on, but charging battery sign

As the title says, my phone won't turn on but upon connecting it to the charger, a charging battery sign will appear and then nothing happens.
If I press the power button again my phone still won't turn on and the charging battery sign no longer appears.
For it to appear again i have to connect and disconnect the charger again.
What seems to be the problem of my phone?