Have you tried plugging it into a different outlet on a different circuit? Maybe something is amiss in your wiring. Or if it's plugged into an AC power conditioner, make sure that is working correctly.
There have been a few posts over the years about the light burning out in the power supply units, but the main unit was still on. Since both your lights are off, then it's not quite the same thing...unless both lights burnt out at the same time? Does the preamp work?
Good Luck!