have to reset clock after each operation. also does not beep when finish just shut down at end of time like you unplug it.

Chris, it sure sounds like you have a bad board. If everything works just fine, that would be my guess. Now TDinatl, your problem is your magnetron tube is leaking RF. After pressing start the magnetron tube comes on 2-3 seconds later, and when that RF (radio frequency) from the leaky mag tube hits the board it shuts down. So you need to replace the magnetron tube.

abadfish66, Great help. Looked on line and it appears that GE has a real issue with this. Now, as an engineer (chemical) I feel confident that if I get the part I can replace it. But am I in over my head? What would you guess the labor would be? The Ge part looks to be $140+, I have found the Samsung exact match, for $60. I relieve you of all liability here. I just think I can, but if I install it wrong, am I going to be exposing my family to microwaves. Just want your thoghts on this. I would say my level is above average on repair things in general, refrigerators, furnaces, etc.