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Why won't my Focus start after an engine change?

I currently own a Ford Focus C-Max - a 2005 model with a TDCi engine. Unfortunately I destroyed the engine when I drove i to water. I got a second hand one from a 2010 C-Max and took it to my mechanic to fit. The mechanic has swapped the new engine into it, but it won't start. He told me he has swapped everything possible from the old engine but it's doing nothing. Any advice would be gratefully received.