Ipod 5 only shows apple with black screen

My apple ipod 5 will not turn on. When I press the sleep button, all that appears is the white apple with a black screen. My home button also doesn't work so I can't press the both button's to restart my ipod. I did leave my ipod in my friend's car for about 9 hours(it's Arizona btw so it's pretty hot!)and when I got it back, I used it for about 4 hours, then it died, I charged it, used it, and when I woke up in the morning, it stopped working. I really don't know what to do so any advice will help! Thank you!