Purchased an over the counter microwave on craigslist, decent looking, doesn't run. Symptoms are works for 2-3 seconds, then shuts off. If you put it on Power level of "0" it will run, obviously not heat, which is why I thought the magnetron. Replaced the magnetron, and that's not the culprit, now I'm thinking control board. Any suggestions, or can anyone tell me what the part number is? Can't seem to find it anwywere!

Thanks!