First Build - White screen to RetroPie logo to white

[Flavor]

Will give this a try when I get a chance. The green light is on when it is white screening. I left the unit on for 2 hours to see if it needed time to process - still white screen.

Tried using a third SD card just to rule out that it's not an issue with the cards I had. Still with the same behavior.

What is the possibility that my CM3 module is defective?

Do you mean the Raspberry Pi Compute Module 3 itself? I think it's a very low probability.

If you can test HDMI, that would be the #1 thing to try. That will tell you a lot about how the system is working.

Another test you can do to see if things are "running" properly is to let the machine boot up (should be less than a 30 seconds) and then hold the power button over for 10 seconds or so. That should tell the system to shut itself down. The green LED and the LCD should turn off. Then you can use the power button to boot it up again.

Also, just so we're on the same page, make sure that your power button works like a momentary "button" like the Nintendo DS Lite (and not like an ON/OFF switch like the GBA).

If you were inclined to try a different SD image, you could try this older CM3 image
https://drive.google.com/open?id=1HXHMWJ...6Gseqd0PjN
or this RetroPie 4.4 image for the Zero
https://drive.google.com/open?id=1qLoBor...uCF1BeJyQx

Either of those could give us a good clue about what might be the problem. The 4.4 Zero image already has the "sleep" I mentioned, and the older CM3 image is from an earlier version of RetroPie that may not exhibit this problem.