Why is my xbox one overheating?

I have followed all the steps given to me to ensure it stops over heating but none of which have seemed to work. My xbox one worked the first day I got it and I played it for a couple of hours straight, but the next day it has stopped working. I have moved it to a well ventilated spot and made sure all power cords were properly enabled. I have given it 24 hours to rest / cool down, but it only took 5 minutes for it to over heat again. The power supply cord/ box doesn't feel hot but the xbox one does. Please help me I'm getting really frustrated