Sorry It is not the news you wanted to hear Matt but it really does sound like a problem either with a door switch or with the control board, There is no reset on microwaves, if the unit were completely dead then I could point you toward the fuse, in this case it will either be one of those problems.
It will need diagnosis and parts, Now the good news here is if the unit is 6 months old then it's covered by the warranty so you can have sears come out and fix it for free.
Give them a call to schedule service, If you need the number let me know.
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It was my pleasure helping you today. Feel free to get back to me here at any time if you have additional questions at no further charge. Sometimes I will have to give bad news, Please try to find it in yourself to rate me for the service not the bad news.
Please also remember if you have future questions regarding a faulty appliance, You can request me personally to assist you with the problem :)