So after transporting my perfectly working WPC (Demo Man) I'm having some issues. I've been looking through the pin wiki but I'm still pretty inept at deciphering it all. http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Power-On_LEDs_and_Sound_Tones_.28Bongs.29

When I turn it on:
-No DMD Display
-No GI lights
-One sound "bong"
-LED D19 Doesn't turn on
-LED D20 Doesn't turn on/flash
-LED D21 Does flash???
-LED D5 is off
-Also I couldn't tell what the normal state is on the Auxiliary 8-Driver board LEDs, but both LED1 and LED2 are on.

Also if it helps, when I turned it on previously:
-DMD was displaying random "fragments"
-I think the GI was off but some Aux Driver powered lights were on
-All flippers were held in the on position
-Fuse F112 was blown (but it is stable now)

Hoping its just something to do with either the Rom chips or a transistor or something?

That did it, thanks! I think the culprit was the KAHR daughterboard I have installed on J210. Also the U5 chip was a little loose as well.