I sent an e-mail to RetroFlag the other day describing the issue and from looking at the photo of the wires I sent, they said the colored wires were in the wrong position. They apologized then gave some directions on how to take the wires out and what the proper color order is.
I tried taking them out of the black plug but it seemed a bit of a hassle. Fortunately a replacement case arrived from Amazon today and the colored wires in the replacement case are in the correct position. I rebuilt my RetroPie and the shutdown and reset worked right away :). Thanks again for the help.
tldr: Original case wires were messed up, replacement worked.
I am having the exact same issue with my Kintaro Kuma 9000. I'm using a retropie image that I downloaded from arcade punks. I had originally used another image which did not have these power issues and booted up fine with the power buttons and showed the red LED light. But then I switched to another image and now have this exact same problem. It starts up and then right when the splash screen ends, it shuts down. Did you ever get a fix for this issue?
@MisterMints Most likely something hardware, try to return it and get another.
Wish it was that simple! My Pi3 is over a year old and was a gift - I treated myself to a new 3B+ and was going to donate the broken one (obviously before it was broken!) to a retro gaming present for my little brother.
At least now he gets the same present but with a brand new 3B+ instead
OK bought everything and built it and it works great. 2tb harddrive would not fit but the 1 tb one does : )
whats words without pics. so here ya go.
deleted case ethernet port,case door hinges came out for room, glued closed. had to put dedicated power to the hd to spin right so extra usb port grafted to the drives power wires while data wires go to pie. runs cool enough 50 degrees-ish so far. case closes tighter than pics when screwed together. just took some quick snaps to share. think it turned out pretty good.