727 Captain’ FLIGHT MANUAL Part II – Aircraft and Systems, page 91 (csx727_manual2.pdf) W10. HYDRAULIC PANEL
Make sure switches 1,3. System A Pump Switches and switches 9,11. System В Pump Switches are ON, and the the lights above them are OUT.

727 Captain’ FLIGHT MANUAL Part II – Aircraft and Systems, page 71 (csx727_manual2.pdf) U03. ELECTRICAL POWER PANEL
Make sure that the 5,14,22. Generator Breaker Switch are closed, if they flick back to the center position, that's fine. I usually return them to the center position if they don't do it themselves. The lights should go out.

There could be something else that might causing your problem, but I'm flying the CS737-100 at the moment. I'll check it out when I finish my current flight.
Scratch that. I was thinking of something on the CS707. :-[

Mark