Meter out the fuses, especially F1 and F2A, and try the solenoid and flasher tests.
On Rollergames there's a relay that switches power between the solenoids and the flashers, the "A/C" relay. It's on the bottom of the playfield near the rear. You might have noticed that if you get a jackpot then immediately put a ball in the pit, it won't pop until the flashers are finished.