As Cosmo wrote, I have also not anymore working SE/30. I suspect, that it has a broken flyback transformer. This on 1990 bought SE/30 worked till last winter, when I got noisy screen after startup. I thought, that it was a SimasicMac. So I replaced capasitors C1, C3, C4, C5, C6, C7, C8, C9, C10...