I suspect you are going to need to provide a crap-load more information before anyone is going hazard a guess at what is going on. Let's start with the basics:

Year
Mileage

Next, what is and is not working? I assume you just replaced the upper radiator hose and refilled with the appropriate fluids (hoepfully you did an oil change as well but that is not part of the diagnostics). Was this before or after the ECM replacement? What prompted the ECM replacement? Do you have any codes when you use the ODB module under the hood?

Now troubleshooting. Does it have spark? Is it getting fuel to the injector rail? If answer to the two above is "yes" what is the compression? Normally I would not jump right to compression but since you overheated it there is a chance of a head gasket failure (somewhat likely) or a warped head (pretty unlikely) both of which would show low compression in one or more cylinders...usually.

Check the 700/900 FAQ's for most of the troubleshooting guidelinse for all of this. If something in the FAQ's does not make sense, try the search function. If you cannot find the answer you need with a search, please post your question, with sufficient information to assist you with a specific problem.

Thanks,

Onkel Udo