Sea doo challenger 2009 wont start

[Ozzydoo]

Hello guys.. I purchased a Sea doo challenger 230 in 2011 brand new used it for two years and then was stored.. in my country it's very hot so was under a shed and covered for 5 years it's a lot I kno but engine and boat in very good condition.. I wanted to use it this season so when I was doing the normal check ups oil .. filters etc and want to fire a test first time I put on the dees key I got the normal two peeps but when I push start nothing happens in both engines.. now after many failure when Iput key it beebs once and samething nothing happens .. I need help.. please note that we don't have a dealer here or mechanics with computers all done manually. Thanks