black screen after dropping it, hard reboot didn't work

I dropped my iphone 4s from my pocket onto the tiled floor in the kitchen. It landed on the case's back but not being a very helpful case it didn't do anything to protect it apparently. I tried doing a hard reboot and it didn't work. When I plug it into the charger it still vibrates saying that it's charging. Before I tried to do the hard reboot Siri was also still working, but I think at some point I managed to turn off my phone while trying to do the reboot. I've been trying to turn it back on but I'm unable to tell if it is or not. I know the phone is charged because this just happened and I had it on charge since around eleven last night.

Please help, I cracked my screen not a month ago and my dad kindly got it fixed somewhere cheap. He and I don't feel confident about fixing it ourselves. I haven't brought this to his attention yet, and I haven't told my mom either, I really would like to know if there is a way that if I left it alone it would sort itself out? If not besides fixing it ourselves what would be something we could do? Thank you so much for helping me with this! :)