Iphone 8 Black Screen

I just got a new iPhone 8 because my previous one was cracked on the front and back. Except for the SIM Card, it is a completely new iPhone 8. I waited to get home to set it up and while I was putting in the Wifi password to allow the new phone to get data from my iCloud, the screen spazzed and went a sort of greenish with red lines through it. I thought maybe it just froze and turned the phone off, and when I tried to turn it back on the screen remained black. I can feel the phone vibrate when I plug it in to a charger or tap the home button, but I cannot do anything. I tried to force restart with volume up, volume down, hold off button (which didn't work) and I plugged it into my computer to see if I could reset it through iTunes, but the phone doesn't show up. Any idea what's going on?