Hi   the microven work with the voltage of 230-250v 50 z.. if it is not a supply card problem..  u see whether the control panel work are not by pressing start button if it did not not start's mean's it is a circuit board problem.. and at same time there will problem with the fan also.. so, it does't start's.. if it is not in warrenty period .. u could dissamble.. it and chek with a muiltimeter .. by verifying the power board, and conntro board.. dissamble and clean it first.. there may be some minute problem so, that it will not work..  don't forget to vote me..  thank u..