Solution to no start

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Car won't start. New battery. Alternator and starter is fine. Fuel pump replaced. Car was in accident few months ago been sitting. Mechanic looked at it saying anti theft issue. All crank no start. No anti theft lights on at all when trying to start. Not sure what's the issue. Seen a video showing corroded cables under battery causing an issue with the grounding. Not sure at all

How long has your 2001 Lincoln Continental had this problem?

A few weeks