I just replaced my iPad mini 4 screen and the home button works fine and so do all the other buttons, but when I try to...

Connect the watch to the charger, then hold the power button until the power off screen comes up. Force touch and click erase. Or go to settings general reset

Unplug and plug in router. Move close to the router (try this step first). Restart iPod. If all else fail try full erase. Update (01/13/2018): Is the iPod used? Or new? A used iPod might need the Wifi antenna replaced or it could’ve come disconnected. Most of those are little (coax) cables but they look different in a phone or ipod/iPad. I wouldn’t suggest doing this yourself because iPods are the hardest Apple device to get into unless you like soldering. Sorry for the late reply. I hole this helps if you’re still having the problem

You need a new front camera assembly. Sometimes when only one camera doesn’t work, it can cause the other one to show up black and disable flashlight. I have experienced this before. I believe the front camera or something in that cable shorted out. Prevent this by turning your phone off before screen repair. Sometimes they are too cheap or short out for no reason.

It’s a bad battery. Sometimes it’s so bad it won’t even turn on. Just replace it or get it replaced. It can happen on different levels. The symptoms you’re describing are caused by a bad battery

If it’s the iPhone 6 Plus, it could be touch disease. Very bad for the iPhone 6 Plus. Google it. If it’s an iPhone 7 Plus then probably just cheap screens

Try a different pair of headphone. The headphones are used as a radio antenna