Xbox one S not turning on

I recently bought an Xbox one s from a local selling app for around $150, he gave me all details on it working and everything even with pictures which I guess turned out to be fake. When I bought it and got back home wanting to test it out, it was not powering on, not even a light, a beep, just nothing. So I immediately tried to contact the person but eventually could not get a refund, I then proceeded to try and look in to see if there was any visible problems with it. My thoughts were the power supply because it does not turn on what so ever. I ordered a replacement power supply hoping for it to work out. Is there any other trouble shooting techniques I can do to try and fix it if the power supply is not the case