flashing apple logo

[NGK]

Flashing apple logo. Then itunes plug then what? I go to itunes and then I am stuck,

 

[J. A.74]

Try force restarting your device. If that doesn't help, use recovery mode to restore it.
Here are the instructions:
If your iPhone, iPad, or iPod touch doesn't respond or won't turn on - Apple Support

Hope that helps.