Tablet Touch Screen Not Working

[AC Question]

Hello 8 am everything is fine. By 10 am yesterday my touch screen stopped working. I have tried the whole hold down volume and power to restart no fix. SOmeone said you need a hard restart but cant not find anywhere how to do that. I tried the whole volume down, power, and home button. All that does is offers me to download a new os system which I have no idea what that means. Can anyone tell me how to hard reset the thing or power it over without being able to use the touch screen so I can either try and fix or take apart and try to see if something came loose?