yamaha 1991 waverunner 650 III?

my waverunner was runinng fine, I took the waverunner out of the water ran the waverunner for 2 or 3 second to flush the water then went home. parked the waverunner in my back yard. next week tried to use it, but my waverunner would not start I tried a new batt. new plugs but it still will not start. (I pressed the start button it tried to start but nothing happened.)we got 1 inch of rain the week before but the waverunner was covered. please help thank you