I would start it up and tap the "Delete" key to enter the BIOS. Go to the monitor tab, lets see what your temps look like in the BIOS. If it's shutting down and staying off this sounds like a thermal issue. Take a picture of the monitor tab and post it here if you can.
Submit photos and a description of your PC to our build showcase
See other custom PC builds and get some ideas for what can be done
Services starting at $149.99