Sad to report my Jr. Can is DOA at new house it was fine last night. Played a game this AM now nothing. Marquee is only light, bummed out for sure
Wow I'm really sorry about that man. Go test the voltages on that switching power supply, espessially the 5v. If it is too high, or too low, the game will not run. That means that you need a new power supply. Make sure the tube on the back of the monitor is glowing red as well. If it is, then you won't be in much trouble. Since your marquee is working, your 100v transformer is likely to be good, as well as the monitor. Test those voltages on the edge connector of your DKJR PCB.
http://www.docstoc.com/docs/45929296/NINTENDO-PINOUTThat link should help with the edge connector pinout, which you should test your 5v from. Report back your findings.