My htc desire 526 wont turn on after leaving it in the heat, why?

[AC Question]

I left my phone in the car heat for a few on accident, but when I went to get it I never noticed that it wasn't working. When I got home and tried to turn it on, it wouldn't so I thought it was dead. I charged it up but everytime I try to turn it on it won't. I searched up ways to fix it and even tried to reset the phone but it doesn't work. It's saying 100% now but it still won't turn on or reset.

 

[nahoku]

It's happened before. Try holding the power button down for about 30 seconds to see if it turns on.