delayed ignition

This is not a quick fix the microwave problem is due to a bad door switch. There are three door switches on the interlock circuit and if any one of them goes bad the unit will not allow it to start. Most times when the switch goes bad it is typically the lower one that burns out or the upper one that burns out. When that happens the unit will not be allowed to start up and run. you would need to take that apart and check out all 3 switches on the interlock circuit.