1993 Taurus wont start

I have a 1993 Taurus wagon that i just purchased. The lady I got it from told me she thought there was a problem with the computer. The car ran fine
for 3 days and then the check engine light came on and it started running rough. I switched the car off and then tried to crank it again and it just turns over but doesnt crank. I thought the battery might be too weak so I charged it... same thing, it only turns over. The thing is.... when i switch the ignition to the 'On' position, I hear the fuel pump come on and instead of it running for a few seconds and cutting off... it constantly runs. Also, the radiator fan is constantly on. I checked all the fluids and they are fine. I checked all the fuses and they are fine also. The belts and hoses are all in good condition and the battery is fully charged. Everything on this car works but it just wont crank. I've checked to see if the plugs are getting spark and they are. I've checked the fuel rail to see if it's getting fuel and it is (it sprayed me in the face). The only problem i've found is that the injectors aren't firing. They're not getting any power at all. I un-plugged one of the injector connectors and connected a test light to it and when I try to start the car... I get nothing from the light which tells me the injectors arent getting any signals from the car's computer. Does this mean that the computer is bad? I dont understand what happened. The car was running great for 3 days and then it just died. Any information would be great. I'd hate to get rid of the car. The engine ran great when it was running and the rest of the car is in good shape.
Info on the car: 1993 Taurus Wagon Engine: 3.8 OHV Essex Transmission: ? Miles: 115,000
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