Step 1: Device Doesn't Start
If your device doesn't all the sudden want to work and no response what so ever here's what to do.
Is no going to fix damaged product from being : dropped, exposure to water, or cracked screen.
Step 2: How to Fix
In the case that you would need to do this here's how. Push the on/off buttons and home buttons at the simultaneously until the apple comes up telling you that it's starting up.
Step 3: That's It
Nothing more to it. If this doesn't work then it's a internal problem