While driving lost power and engine shut off

So about two weeks ago I was at a party, and on my way back on the highway my car started to lose power as I was driving it. It started to stutter, so I managed to pull over to the nearest exit and I was doing so the engine shut off. Every thing was still on such as the radio and the lights but the engine quit running. From that point on the car has not started. It cranks but does not start. I had the car towed back and when I had the chance to I put in a code scanner and I received the code "P0320" which was the "ignition/distributor engine speed input circuit". And when I looked it up it was said that the code could be multiple things, such as a CKP or a CMP sensor. So I then proceeded to change the CMP (camshaft position sensor). But that still didn't get the car to start. So I decided to hire a mechanic to come and looks and try to figure out himself what the issue was. He began testing the distributor coil pack and said that the distributor it self wasn't getting any signal so we replaced it. And when we replaced it, it now had signal but still, no start. So he then started unplugging the CMP sensor and the CKP (crank position sensor) and used a test light to determine if they were getting signal, and surely enough they went. So he then started checking the fuses, and when he got to the fuses that are in the interior of the vehicle, he then pulled out a blown fuse that had a copper wire going from one end to the other end of the fuse. (I bought the car in an tow company's auction so the previous owner did this). So we replaced the sensor, but with the test light he noticed that not one single fuse was getting any signal. He then said that the issue is that the blown fuse with the copper bond had been causing the car to have problems electrically. He then said that the computer or (ECM) had been damaged. Before I have the ECM replaced I want to know if anyone knows if this is in fact the issue. I need a second opinion, because this had been really stressing, especially how expensive it is to have the ECM replaced?