My nextbook 7 is frozen on the home screen after i put a different charger in, what do it do ?

Reset it by cutting it off then press the top volume button and power button hold it for at least 7 seconds then it should say no command go down or up but using the volume buttons ..... please have me known if this was helpful please click helpful

Try using the reset switch (a small hole in the case) put a straightened paperclip or a pin very gently through the hole until yuo meet a resistance. Press very gently and this will reset the tablet.