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usually these units reset automatically after a shock! It takes time for the over load circuit to reinstate power. If by 5 hours you have no luck , then the internal ceramic fuse has blown ( under top of cover)
It could be that the "grinding" noise was actually "arcing" taking place inside the cavity or uder the cover. The magnatron is possibly damaged or the h.v. diode. Should be repaired by qualified repairman