Boots to retropie splash then shuts off

[r0ckarong]

So the fact that both blue and green LED on the back would have led me to suspect there's something wrong much earlier.

Can you provide me with a list of conditions what LED should be doing what and I am happy to sort them into something usable. My profession is in technical documentation so I am used to this kind of work. Same goes for other "alternate states" of the hardware that you shouldn't be seeing when doing it right but you spend much more time explaining how NOT to do things then how to do it the right way just to make sure.

EDIT: I have started to collect this stuff and hope to come up with some more during my build. I will supply that information to you as I move along.