Failing to press the on button, battery low or faulty.
Is your ipod a 5th generation
Most likely cause is the battery is bad.
To turn on a IPod that won't turn on you need to hold down the top button and the bottom (i think) to reboot (not restart) a IPod
you can turn on the side of the ipod touch.
It should only do that if It died completly cause when it dies it turns off
An iPod with a dead battery will refuse to turn on, and it will say to plug in first. In order to turn on a uncharged iPod, you will need to plug it in for a few minutes first.
You can turn off the iPod Touch if you jailbreak it.
ipod nano 5th generation,
Yes, the ipod 5th generation does have a forward facing camera.
5th Generation Ipod Classic
charge it
For the Ipod Nano and the Ipod classic, you just hold the play button down for 5 seconds or so. Do that again to turn it back on.