Yes. Check first for signs of loose connection on the leads to the magnetron. [COLOR="Red"]STEP ONE: ALWAYS UNPLUG MACHINE AND SHORT THE CAPACITOR BEFORE PUTTING HANDS INTO THE CABINET.[/COLOR] If you don't see anything obvious, you may need to replace the magnetron. This is trickier than it looks. You must do a microwave leak test whenever you remove and replace a magnetron. Excessive microwave leakage inside the cabinet can wreck havoc on the electronic controls. Also, a bad magnetron is very often a symptom of another component failure.