Why can't I boot my samsung galaxy mini

Today I used my phone as usual. But at once all apps started crashing. Normally I tried to reboot, but my phone got stuck at splash text "samsung". I googled what to do and tried to enter recovery mode. But just when something showed up, my phone froze completely. It didnt respond fo any button presses. So I had to remove the battery to power it off. When I tried to power it on after that, completely nothing happened and my phone is completely dead now.

What to do now?