Once all was done, I booted up the system off of a power supply, without the power board. The first Boot I got the Retropie logo, but then I got a black screen and was taken to the usual Terminal login. It auto logged in, I got the Linux copyright information, and then I got a blank terminal screen. I unplugged and re-plugged in the pi, and everything woork normally (Retropie, ES splash screen, Retropie Menu). I cycled the power again, and got the first result with no GUI.
I tried reflashing the card, but got the same results. Basically, every other power cycle is unsuccessful.
What's going on here?