azama most new pc and power supply wont turn on if there a short or an issue. i would start by opening the pc and check that the ram and all cards are seated. also check and push down on the cables to see that there all connected. also check that the cpu and heat sink are fine. I seen where heat sinks have ripped off the cpu in shipping. if you cant return the pc then see if you can make a claim with the shipper if it was shipped by a shipping company.