my ipod will not turn on model A1421

Base on that model number, that's an iPod touch, is that correct? If so, try doing a restart.

Restart your iPhone, iPad, or iPod touch - Apple Support

In your case, since iPod touch is not responsive, How to force restart section. Do this with iPod connected to power, if the battery is drained.

Dead battery. Cooked logic board. It could be any number of things. What have you tried?