My Cellfone become dead. What should I do? Help

I was trying to install CWM Recovery on my grand 2 with help of App Called 'Custom Rom' i selected CWM 3+ and accept the installation. And suddenly my cell is not responding. It didnt show any disply it also not wake up on laptop even power button is not able too turn on its display. But it vibrates when i coneect it to pc by pressing volume + power button.

No other response from fone. Please helm me what shluld i do.