My microwave shorted the kitchen outlets today and I checked the breaker box. The breakers were still in the on position and tight. So, I suspected a loose connection in one of the outlets. I unplugged all the appliances and pulled every outlet out of the walls. I looked for a backstab that was loose or a fried wire. Nothing...So I put it all back together. I tried plugging the fridge in and it shorted the kitchen out again. But, the fridge is wired to an independent breaker. I looked at the breaker box; the fridge outlet breaker and the kitchen breaker did not trip. Both of them were still on and tight. So, I reset the breakers (off and then on) and tried plugging the microwave and range in while leaving the fridge unplugged. The microwave and range both got power. I thought my job was done. I tried to warm up a cup of coffee in the microwave and the kitchen shorts out again. As was before, the kitchen breaker did not trip. Any idea what is going on?

I install an external circuit to a storage shed using a GFI outlet where the cable exists the house. All outlets tested fine using an outlet tester, and I passed the electrical inspection. After about a week I plugged in a light in the shed but had no power. The GFI tripped and would not reset. I replaced the GFI and the new one would not reset. Then I replaced the GFI with a normal outlet and all outlets tested OK. Do I have bad luck picking GFIs or is there a problem downstream that the outlet tester is not picking up? Thank for your help. Ed