[fintstone]

I don't know anything about your specific microwave, but if a typical microwave runs (microwaves) with the door open, you have a serious safety problem and should not use it at all(microwave energy is very harmful). Per federal law, all microwaves have a safety interlock switch to ensure that they cannot operate with the door open. In fact, they are required to have a safety switch to disable the oven if the interlock fails.

The inverter technology is pretty cool as compared to other microwaves. If a microwave has settings less than high, the magnetron is cycled on and off while the inverter technology allows it to actually operate at a lower level. From what I can tell, there is little difference in results other than possibly less energy used and a little more expensive machine.