Q: how much would it cost to replace the whole computer system of a 2010 ford fusion? on 2010 Ford Fusion

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I bought a 2010 ford focus at the auction. While trying to have the whole vehicle checked, I am told that "there are problems with the computer". I don't know what those problems are, but since I got the car for a very good price, I am trying to decide whether it would be worthwhile to replace the computer myself. The decision is hinged on how much it would cost me.
(1) Answer
Unfortunately, it's wide open as to what is causing the problem. The car has definitely been through somehting substantial.