My Iphone 5 turned off and won't turn back on?

I was just in the middle of checking facebook after texting my boyfriend. My phone went black like it had shut off but no Apple image appeared. Now the phone will not turn on nor will it show any insignia when I plug it into a charger or anything. Please help me!

Added (1). I tried holding down the home and lock buttons (a reset) and that didn't work either.

U shuld try this zbigz.com

Try to connect it with itunes and then press the power key+home key for 10 seconds then leave the poower key while pressing the home key.
may be it will helps you.