DMD is suddenly dead. Anyone have an idea how to properly diagnose this?

Here's what happened....

I hadn't played Fastbreak in about a month, so I fired it up and immediately achieved both multiballs on my first ball. Then, suddenly the flippers dies, all but the lower playfield LEDs go black, AND the DMD went blank.

I opened up the head, rebooted the pin, and noticed that the LEDs on the CPU board, never got out of the boot up LED sequence (At power-on, LED201 and LED202 should be ON. LED203 should be OFF). It was just stuck there.

I started reading up diagnosing steps on my iPad for the next 10 minutes.

Then suddenly, out of nowhere, all of the LEDs on my playfield powered up, I heard the boot up chime, and the LEDs on the CPU board, finally switched to showing a regular play status (LED201 should be OFF. LED202 should be ON. LED203 should be FLASHING.) I hit the start button, and sure enough suddenly I'm able to start a game.

Only problem, even though everything else seems to be working fine, the DMD never came back on.

And so here I am, with a DMD that has gone blank.

Any ideas or tips you guys can give me would be totally appreciated.

Thanks all!

-J