IPhone 5c screen is black

My iPhone 5c died a couple days ago so I plugged it in and realized it wasn't charging. I've left it on the charger for a sol day and still nothing it would just vibrate every 10 seconds. I also tried restarting it by hold the sleep and home button for 10 seconds but still nothing. Any ideas what happened? Also if I get this checked out by apple how much will it possibly cost to fix?

Just leave it for a few days. Don't charge it. Just leave it alone.

Plug it into your pc