will not start

I just purchased a Sea Ray 210 Signature with a 5.7 EFI Merc with Alpha One with a shift and throttle lever that includes trim switch and ignition cutout switch. When I test rode it, it started and ran perfectly. The dealer winterized it and when completing this, they started it right up. I...

I will try to make this as concise as possible. I need help to recover just a bit of a lost boating season! Problem: Engine will not start Boat Information: 2000 Sea Ray 210SD, 5.0 EFI HID: SERV2478I900 Motor: OL626623 For the two years I have owned this boat, I have had absolutely no...