How to reboot my Polaroid tablet

[Emilyl]

My younger sister plugged a universal ac adaptor in the earplug hole of my Polaroid tablet model prid702c and I tried everything and it still doesn't reboot, what do I do?

 

[bryonhowley]

My younger sister plugged a universal ac adaptor in the earplug hole of my Polaroid tablet model prid702c and I tried everything and it still doesn't reboot, what do I do?

Holding the power button down for 5 seconds or so should force it to shutdown.