This makes 2 of us. Its happened to me, I jetted my car and it died when i got home. Its the ECU, you must of got water in.
When you turn your key, do you get the engine light on (I didnt). Try borrowing another ECU and plug in and turn the key (you should get the engine light but wont start cos of the immo), this way you can make sure before sourcing a ECU.