1996 Volvo 850 turns over but dosent start

Electrical problem
1996 Volvo 850 Front Wheel Drive Automatic 160+ miles

I have changed the coil on my used volvo and checked the censers on it and all were fine they had the proper oem spec. Current flow but still it dosent start I dont know where my ECU is located on or inside the car I have lookied but no luck I cant seam to find a pic. Online or in books that I have seen I just got gas in it drove it to the gas station and after I got gas it didnt start it turned over but the electrical failed somewhere I have spent numerious hours trying to find out I checked the distributor also but nothing seemed to be wrong with it I just cant find the sorce of the problem if you can send me a picture of where the ECU is located please do. Or have a profesinol tip or guess please tell me im getting desprit for an answer but have almost no money to spend due to collage. Lol if you can help thanks