My Phone won't turn on

[Jazzy_emi]

I have a HTC desire c, and when I went to my friends house I had no signal. I was always told to restart my phone if I had no signal, so I did just that. Since then my phone hasn't been able to turn on, it had 80% battery, I tried charging it overnight and it still hasn't worked. PLEASE HELP

 

[Jazzy_emi]

And the charging screen doesn't appear when I charge it....