The computer is not responding

I sent my computer to be repaired but they couldn't do it and sent it back. The real problem is that the computer is not responding at all now. It used to light LEDs and stuff like that. Now the LEDs don't light up either. It doesn't light up when I plug it in to charge either. Before sending it to be repaired, I was going to install new RAM but it didn't work. Then I took it out but while I was removing it, the tip of the screwdriver touched the copper plate (I forgot to remove the battery) and a spark occurred and the computer never turned on again after that moment.