Seadoo gtx 2008 no beep
So I have a 2008 seadoo gtx 215. It has the Siemens ecu in it. I had just put a new fuel pump in it and went to start it and it turned over a few times and started but was running rough. We pulled the plugs to check all three cylinders for spark and as we were testing the machine turned off. Now when I put the DESS key on it simply powers the display on that says seadoo and briefly flashes the hours but NO KEY BEEP. We have changed the main relay and have rigorously tested all fuses and grounds and power lines to no avail. No idea what else it could be. When I hook my computer up to the seadoo to read the codes etc it says no ecu. Any idea which direction I should go next in diagnosing this? Any info at all is appreciated.